bpo-29464: Rename METH_FASTCALL to METH_FASTCALL|METH_KEYWORDS and make (#1955)

the bare METH_FASTCALL be used for functions with positional-only
parameters.
diff --git a/Objects/clinic/longobject.c.h b/Objects/clinic/longobject.c.h
index 81bc97f..1b706d6 100644
--- a/Objects/clinic/longobject.c.h
+++ b/Objects/clinic/longobject.c.h
@@ -139,7 +139,7 @@
 "    is raised.");
 
 #define INT_TO_BYTES_METHODDEF    \
-    {"to_bytes", (PyCFunction)int_to_bytes, METH_FASTCALL, int_to_bytes__doc__},
+    {"to_bytes", (PyCFunction)int_to_bytes, METH_FASTCALL|METH_KEYWORDS, int_to_bytes__doc__},
 
 static PyObject *
 int_to_bytes_impl(PyObject *self, Py_ssize_t length, PyObject *byteorder,
@@ -186,7 +186,7 @@
 "    Indicates whether two\'s complement is used to represent the integer.");
 
 #define INT_FROM_BYTES_METHODDEF    \
-    {"from_bytes", (PyCFunction)int_from_bytes, METH_FASTCALL|METH_CLASS, int_from_bytes__doc__},
+    {"from_bytes", (PyCFunction)int_from_bytes, METH_FASTCALL|METH_KEYWORDS|METH_CLASS, int_from_bytes__doc__},
 
 static PyObject *
 int_from_bytes_impl(PyTypeObject *type, PyObject *bytes_obj,
@@ -211,4 +211,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=c1ce9c11929b0bab input=a9049054013a1b77]*/
+/*[clinic end generated code: output=c9adfdc329651cc4 input=a9049054013a1b77]*/