bpo-35489: Use "const Py_UNICODE *" for the Py_UNICODE converter in AC. (GH-11150)

diff --git a/Modules/_winapi.c b/Modules/_winapi.c
index 852e0a7..cdb45c2 100644
--- a/Modules/_winapi.c
+++ b/Modules/_winapi.c
@@ -995,13 +995,14 @@
 [clinic start generated code]*/
 
 static PyObject *
-_winapi_CreateProcess_impl(PyObject *module, Py_UNICODE *application_name,
+_winapi_CreateProcess_impl(PyObject *module,
+                           const Py_UNICODE *application_name,
                            PyObject *command_line, PyObject *proc_attrs,
                            PyObject *thread_attrs, BOOL inherit_handles,
                            DWORD creation_flags, PyObject *env_mapping,
-                           Py_UNICODE *current_directory,
+                           const Py_UNICODE *current_directory,
                            PyObject *startup_info)
-/*[clinic end generated code: output=2ecaab46a05e3123 input=42ac293eaea03fc4]*/
+/*[clinic end generated code: output=9b2423a609230132 input=42ac293eaea03fc4]*/
 {
     PyObject *ret = NULL;
     BOOL result;
diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index 1bfc4dd..f5f461b 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -1712,9 +1712,9 @@
 [clinic start generated code]*/
 
 static PyObject *
-array_array_fromunicode_impl(arrayobject *self, Py_UNICODE *ustr,
+array_array_fromunicode_impl(arrayobject *self, const Py_UNICODE *ustr,
                              Py_ssize_clean_t ustr_length)
-/*[clinic end generated code: output=ebb72fc16975e06d input=150f00566ffbca6e]*/
+/*[clinic end generated code: output=cf2f662908e2befc input=150f00566ffbca6e]*/
 {
     char typecode;
 
diff --git a/Modules/clinic/_winapi.c.h b/Modules/clinic/_winapi.c.h
index 241c18e..79d85ff 100644
--- a/Modules/clinic/_winapi.c.h
+++ b/Modules/clinic/_winapi.c.h
@@ -300,25 +300,26 @@
     {"CreateProcess", (PyCFunction)(void(*)(void))_winapi_CreateProcess, METH_FASTCALL, _winapi_CreateProcess__doc__},
 
 static PyObject *
-_winapi_CreateProcess_impl(PyObject *module, Py_UNICODE *application_name,
+_winapi_CreateProcess_impl(PyObject *module,
+                           const Py_UNICODE *application_name,
                            PyObject *command_line, PyObject *proc_attrs,
                            PyObject *thread_attrs, BOOL inherit_handles,
                            DWORD creation_flags, PyObject *env_mapping,
-                           Py_UNICODE *current_directory,
+                           const Py_UNICODE *current_directory,
                            PyObject *startup_info);
 
 static PyObject *
 _winapi_CreateProcess(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 {
     PyObject *return_value = NULL;
-    Py_UNICODE *application_name;
+    const Py_UNICODE *application_name;
     PyObject *command_line;
     PyObject *proc_attrs;
     PyObject *thread_attrs;
     BOOL inherit_handles;
     DWORD creation_flags;
     PyObject *env_mapping;
-    Py_UNICODE *current_directory;
+    const Py_UNICODE *current_directory;
     PyObject *startup_info;
 
     if (!_PyArg_ParseStack(args, nargs, "ZOOOikOZO:CreateProcess",
@@ -943,4 +944,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=1568ad4bd625f2af input=a9049054013a1b77]*/
+/*[clinic end generated code: output=145d0d362167c1b1 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/arraymodule.c.h b/Modules/clinic/arraymodule.c.h
index aa99388..0d10087 100644
--- a/Modules/clinic/arraymodule.c.h
+++ b/Modules/clinic/arraymodule.c.h
@@ -376,14 +376,14 @@
     {"fromunicode", (PyCFunction)array_array_fromunicode, METH_O, array_array_fromunicode__doc__},
 
 static PyObject *
-array_array_fromunicode_impl(arrayobject *self, Py_UNICODE *ustr,
+array_array_fromunicode_impl(arrayobject *self, const Py_UNICODE *ustr,
                              Py_ssize_clean_t ustr_length);
 
 static PyObject *
 array_array_fromunicode(arrayobject *self, PyObject *arg)
 {
     PyObject *return_value = NULL;
-    Py_UNICODE *ustr;
+    const Py_UNICODE *ustr;
     Py_ssize_clean_t ustr_length;
 
     if (!PyArg_Parse(arg, "u#:fromunicode", &ustr, &ustr_length)) {
@@ -505,4 +505,4 @@
 
 #define ARRAY_ARRAYITERATOR___SETSTATE___METHODDEF    \
     {"__setstate__", (PyCFunction)array_arrayiterator___setstate__, METH_O, array_arrayiterator___setstate____doc__},
-/*[clinic end generated code: output=3a4c6f3deb597bfd input=a9049054013a1b77]*/
+/*[clinic end generated code: output=3d2bb1aa81541cbd input=a9049054013a1b77]*/
diff --git a/Modules/clinic/posixmodule.c.h b/Modules/clinic/posixmodule.c.h
index 8069070..6d523bc 100644
--- a/Modules/clinic/posixmodule.c.h
+++ b/Modules/clinic/posixmodule.c.h
@@ -1329,7 +1329,7 @@
     {"system", (PyCFunction)(void(*)(void))os_system, METH_FASTCALL|METH_KEYWORDS, os_system__doc__},
 
 static long
-os_system_impl(PyObject *module, Py_UNICODE *command);
+os_system_impl(PyObject *module, const Py_UNICODE *command);
 
 static PyObject *
 os_system(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
@@ -1337,7 +1337,7 @@
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"command", NULL};
     static _PyArg_Parser _parser = {"u:system", _keywords, 0};
-    Py_UNICODE *command;
+    const Py_UNICODE *command;
     long _return_value;
 
     if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
@@ -5327,7 +5327,8 @@
     {"startfile", (PyCFunction)(void(*)(void))os_startfile, METH_FASTCALL|METH_KEYWORDS, os_startfile__doc__},
 
 static PyObject *
-os_startfile_impl(PyObject *module, path_t *filepath, Py_UNICODE *operation);
+os_startfile_impl(PyObject *module, path_t *filepath,
+                  const Py_UNICODE *operation);
 
 static PyObject *
 os_startfile(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
@@ -5336,7 +5337,7 @@
     static const char * const _keywords[] = {"filepath", "operation", NULL};
     static _PyArg_Parser _parser = {"O&|u:startfile", _keywords, 0};
     path_t filepath = PATH_T_INITIALIZE("startfile", "filepath", 0, 0);
-    Py_UNICODE *operation = NULL;
+    const Py_UNICODE *operation = NULL;
 
     if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
         path_converter, &filepath, &operation)) {
@@ -6757,4 +6758,4 @@
 #ifndef OS_GETRANDOM_METHODDEF
     #define OS_GETRANDOM_METHODDEF
 #endif /* !defined(OS_GETRANDOM_METHODDEF) */
-/*[clinic end generated code: output=d62c0bb988141e70 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=7ebb53d872bab149 input=a9049054013a1b77]*/
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index d05724a..0ea391e 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -4215,8 +4215,8 @@
 [clinic start generated code]*/
 
 static long
-os_system_impl(PyObject *module, Py_UNICODE *command)
-/*[clinic end generated code: output=96c4dffee36dfb48 input=303f5ce97df606b0]*/
+os_system_impl(PyObject *module, const Py_UNICODE *command)
+/*[clinic end generated code: output=5b7c3599c068ca42 input=303f5ce97df606b0]*/
 {
     long result;
     Py_BEGIN_ALLOW_THREADS
@@ -11224,8 +11224,9 @@
 [clinic start generated code]*/
 
 static PyObject *
-os_startfile_impl(PyObject *module, path_t *filepath, Py_UNICODE *operation)
-/*[clinic end generated code: output=912ceba79acfa1c9 input=63950bf2986380d0]*/
+os_startfile_impl(PyObject *module, path_t *filepath,
+                  const Py_UNICODE *operation)
+/*[clinic end generated code: output=66dc311c94d50797 input=63950bf2986380d0]*/
 {
     HINSTANCE rc;