bpo-35081: Add pycore_ prefix to internal header files (GH-10263)

* Rename Include/internal/ header files:

  * pyatomic.h -> pycore_atomic.h
  * ceval.h -> pycore_ceval.h
  * condvar.h -> pycore_condvar.h
  * context.h -> pycore_context.h
  * pygetopt.h -> pycore_getopt.h
  * gil.h -> pycore_gil.h
  * hamt.h -> pycore_hamt.h
  * hash.h -> pycore_hash.h
  * mem.h -> pycore_mem.h
  * pystate.h -> pycore_state.h
  * warnings.h -> pycore_warnings.h

* PCbuild project, Makefile.pre.in, Modules/Setup: add the
  Include/internal/ directory to the search paths of header files.
* Update includes. For example, replace #include "internal/mem.h"
  with #include "pycore_mem.h".
diff --git a/Objects/abstract.c b/Objects/abstract.c
index 305910c..be4758d 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -1,7 +1,7 @@
 /* Abstract Object Interface (many thanks to Jim Fulton) */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include <ctype.h>
 #include "structmember.h" /* we need the offsetof() macro from there */
 #include "longintrepr.h"
diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index 782e275..7a0c340 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -2,8 +2,8 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 #include "structmember.h"
 #include "bytes_methods.h"
 #include "bytesobject.h"
diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 1b36661..c912fc0 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -3,8 +3,8 @@
 #define PY_SSIZE_T_CLEAN
 
 #include "Python.h"
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 
 #include "bytes_methods.h"
 #include "pystrhex.h"
diff --git a/Objects/call.c b/Objects/call.c
index bda0573..9061d0b 100644
--- a/Objects/call.c
+++ b/Objects/call.c
@@ -1,5 +1,5 @@
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "frameobject.h"
 
 
diff --git a/Objects/cellobject.c b/Objects/cellobject.c
index 7b05e61..0b390c7 100644
--- a/Objects/cellobject.c
+++ b/Objects/cellobject.c
@@ -1,8 +1,8 @@
 /* Cell object implementation */
 
 #include "Python.h"
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 
 PyObject *
 PyCell_New(PyObject *obj)
diff --git a/Objects/classobject.c b/Objects/classobject.c
index c4efaf2..93d1c67 100644
--- a/Objects/classobject.c
+++ b/Objects/classobject.c
@@ -1,8 +1,8 @@
 /* Class object implementation (dead now except for methods) */
 
 #include "Python.h"
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 #include "structmember.h"
 
 #define TP_DESCR_GET(t) ((t)->tp_descr_get)
diff --git a/Objects/codeobject.c b/Objects/codeobject.c
index cedf11e..6d8e9ac 100644
--- a/Objects/codeobject.c
+++ b/Objects/codeobject.c
@@ -3,7 +3,7 @@
 #include "Python.h"
 #include "code.h"
 #include "structmember.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 
 /* Holder for co_extra information */
 typedef struct {
diff --git a/Objects/descrobject.c b/Objects/descrobject.c
index 82afa8c..a23b97f 100644
--- a/Objects/descrobject.c
+++ b/Objects/descrobject.c
@@ -1,7 +1,7 @@
 /* Descriptors -- a new, flexible way to describe attributes */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "structmember.h" /* Why is this not included in Python.h? */
 
 /*[clinic input]
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 363d902..a9ae907 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -111,7 +111,7 @@
 #define PyDict_MINSIZE 8
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "dict-common.h"
 #include "stringlib/eq.h"    /* to get unicode_eq() */
 
diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index 6aa3d8f..da79260 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -6,8 +6,8 @@
 
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 #include "structmember.h"
 #include "osdefs.h"
 
diff --git a/Objects/frameobject.c b/Objects/frameobject.c
index 64ee386..7704022 100644
--- a/Objects/frameobject.c
+++ b/Objects/frameobject.c
@@ -1,7 +1,7 @@
 /* Frame object implementation */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 
 #include "code.h"
 #include "frameobject.h"
diff --git a/Objects/funcobject.c b/Objects/funcobject.c
index c2f79c0..e5278f0 100644
--- a/Objects/funcobject.c
+++ b/Objects/funcobject.c
@@ -2,8 +2,8 @@
 /* Function object implementation */
 
 #include "Python.h"
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 #include "code.h"
 #include "structmember.h"
 
diff --git a/Objects/genobject.c b/Objects/genobject.c
index 453b100..885b3f2 100644
--- a/Objects/genobject.c
+++ b/Objects/genobject.c
@@ -1,7 +1,7 @@
 /* Generator object implementation */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "frameobject.h"
 #include "structmember.h"
 #include "opcode.h"
diff --git a/Objects/iterobject.c b/Objects/iterobject.c
index 5f5ebfc..23f0639 100644
--- a/Objects/iterobject.c
+++ b/Objects/iterobject.c
@@ -1,8 +1,8 @@
 /* Iterator objects */
 
 #include "Python.h"
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 
 typedef struct {
     PyObject_HEAD
diff --git a/Objects/listobject.c b/Objects/listobject.c
index e85fa5c..e38b21f 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -1,7 +1,7 @@
 /* List object implementation */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "accu.h"
 
 #ifdef STDC_HEADERS
diff --git a/Objects/memoryobject.c b/Objects/memoryobject.c
index adaa67c..f234bb4 100644
--- a/Objects/memoryobject.c
+++ b/Objects/memoryobject.c
@@ -1,8 +1,8 @@
 /* Memoryview object implementation */
 
 #include "Python.h"
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 #include "pystrhex.h"
 #include <stddef.h>
 
diff --git a/Objects/methodobject.c b/Objects/methodobject.c
index 9176e39..b0bbfa2 100644
--- a/Objects/methodobject.c
+++ b/Objects/methodobject.c
@@ -2,8 +2,8 @@
 /* Method object implementation */
 
 #include "Python.h"
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 #include "structmember.h"
 
 /* Free list for method objects to safe malloc/free overhead
diff --git a/Objects/moduleobject.c b/Objects/moduleobject.c
index 5181941..7fb711a 100644
--- a/Objects/moduleobject.c
+++ b/Objects/moduleobject.c
@@ -2,7 +2,7 @@
 /* Module object implementation */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "structmember.h"
 
 static Py_ssize_t max_module_number;
diff --git a/Objects/object.c b/Objects/object.c
index b72ad01..f7395c7 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -2,8 +2,8 @@
 /* Generic object operations; and implementation of None */
 
 #include "Python.h"
-#include "internal/pystate.h"
-#include "internal/context.h"
+#include "pycore_state.h"
+#include "pycore_context.h"
 #include "frameobject.h"
 
 #ifdef __cplusplus
diff --git a/Objects/obmalloc.c b/Objects/obmalloc.c
index 88ded83..6a65a15 100644
--- a/Objects/obmalloc.c
+++ b/Objects/obmalloc.c
@@ -1,5 +1,5 @@
 #include "Python.h"
-#include "internal/mem.h"
+#include "pycore_mem.h"
 
 #include <stdbool.h>
 
diff --git a/Objects/odictobject.c b/Objects/odictobject.c
index 67c3674..81c996b 100644
--- a/Objects/odictobject.c
+++ b/Objects/odictobject.c
@@ -465,7 +465,7 @@
 */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "structmember.h"
 #include "dict-common.h"
 #include <stddef.h>
diff --git a/Objects/setobject.c b/Objects/setobject.c
index aa1f4ee..42fe80f 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -32,7 +32,7 @@
 */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "structmember.h"
 
 /* Object used as dummy key to fill deleted entries */
diff --git a/Objects/sliceobject.c b/Objects/sliceobject.c
index 2288df5..9f1cf78 100644
--- a/Objects/sliceobject.c
+++ b/Objects/sliceobject.c
@@ -14,8 +14,8 @@
 */
 
 #include "Python.h"
-#include "internal/mem.h"
-#include "internal/pystate.h"
+#include "pycore_mem.h"
+#include "pycore_state.h"
 #include "structmember.h"
 
 static PyObject *
diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index 288f134..cce266f 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -2,7 +2,7 @@
 /* Tuple object implementation */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "accu.h"
 
 /*[clinic input]
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 722fe5f..9a390b3 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -1,7 +1,7 @@
 /* Type object implementation */
 
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "frameobject.h"
 #include "structmember.h"
 
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index f3f940a..3692da6 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -40,7 +40,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
-#include "internal/pystate.h"
+#include "pycore_state.h"
 #include "ucnhash.h"
 #include "bytes_methods.h"
 #include "stringlib/eq.h"