gh-106320: Create pycore_modsupport.h header file (#106355)

Remove the following functions from the C API, move them to the internal C
API: add a new pycore_modsupport.h internal header file:

* PyModule_CreateInitialized()
* _PyArg_NoKwnames()
* _Py_VaBuildStack()

No longer export these functions.

Objects/boolobject.c

@@ -1,8 +1,9 @@
 /* Boolean type, a subtype of int */
 
 #include "Python.h"
-#include "pycore_object.h"      // _Py_FatalRefcountError()
-#include "pycore_long.h"        // FALSE_TAG TRUE_TAG
+#include "pycore_long.h"          // FALSE_TAG TRUE_TAG
+#include "pycore_modsupport.h"    // _PyArg_NoKwnames()
+#include "pycore_object.h"        // _Py_FatalRefcountError()
 #include "pycore_runtime.h"       // _Py_ID()
 
 #include <stddef.h>

Objects/call.c

@@ -2,6 +2,7 @@
 #include "pycore_call.h"          // _PyObject_CallNoArgsTstate()
 #include "pycore_ceval.h"         // _Py_EnterRecursiveCallTstate()
 #include "pycore_dict.h"          // _PyDict_FromItems()
+#include "pycore_modsupport.h"    // _Py_VaBuildStack()
 #include "pycore_object.h"        // _PyCFunctionWithKeywords_TrampolineCall()
 #include "pycore_pyerrors.h"      // _PyErr_Occurred()
 #include "pycore_pystate.h"       // _PyThreadState_GET()

Objects/enumobject.c

@@ -3,6 +3,7 @@
 #include "Python.h"
 #include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include "pycore_long.h"          // _PyLong_GetOne()
+#include "pycore_modsupport.h"    // _PyArg_NoKwnames()
 #include "pycore_object.h"        // _PyObject_GC_TRACK()
 
 #include "clinic/enumobject.c.h"

Objects/floatobject.c

@@ -9,6 +9,7 @@
 #include "pycore_initconfig.h"    // _PyStatus_OK()
 #include "pycore_interp.h"        // _PyInterpreterState.float_state
 #include "pycore_long.h"          // _PyLong_GetOne()
+#include "pycore_modsupport.h"    // _PyArg_NoKwnames()
 #include "pycore_object.h"        // _PyObject_Init()
 #include "pycore_pymath.h"        // _PY_SHORT_FLOAT_REPR
 #include "pycore_pystate.h"       // _PyInterpreterState_GET()

Objects/listobject.c

@@ -5,6 +5,7 @@
 #include "pycore_interp.h"        // PyInterpreterState.list
 #include "pycore_list.h"          // struct _Py_list_state, _PyListIterObject
 #include "pycore_long.h"          // _PyLong_DigitCount
+#include "pycore_modsupport.h"    // _PyArg_NoKwnames()
 #include "pycore_object.h"        // _PyObject_GC_TRACK()
 #include "pycore_tuple.h"         // _PyTuple_FromArray()
 #include <stddef.h>

Objects/moduleobject.c

@@ -5,8 +5,9 @@
 #include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include "pycore_interp.h"        // PyInterpreterState.importlib
 #include "pycore_object.h"        // _PyType_AllocNoTrack
-#include "pycore_pystate.h"       // _PyInterpreterState_GET()
 #include "pycore_moduleobject.h"  // _PyModule_GetDef()
+#include "pycore_modsupport.h"    // _PyModule_CreateInitialized()
+#include "pycore_pystate.h"       // _PyInterpreterState_GET()
 #include "structmember.h"         // PyMemberDef
 
 

Objects/rangeobject.c

@@ -2,8 +2,9 @@
 
 #include "Python.h"
 #include "pycore_abstract.h"      // _PyIndex_Check()
-#include "pycore_range.h"
 #include "pycore_long.h"          // _PyLong_GetZero()
+#include "pycore_modsupport.h"    // _PyArg_NoKwnames()
+#include "pycore_range.h"
 #include "pycore_tuple.h"         // _PyTuple_ITEMS()
 #include "structmember.h"         // PyMemberDef
 

Objects/setobject.c

@@ -32,6 +32,7 @@
 */
 
 #include "Python.h"
+#include "pycore_modsupport.h"    // _PyArg_NoKwnames()
 #include "pycore_object.h"        // _PyObject_GC_UNTRACK()
 #include <stddef.h>               // offsetof()
 

Objects/tupleobject.c

@@ -5,6 +5,7 @@
 #include "pycore_abstract.h"      // _PyIndex_Check()
 #include "pycore_gc.h"            // _PyObject_GC_IS_TRACKED()
 #include "pycore_initconfig.h"    // _PyStatus_OK()
+#include "pycore_modsupport.h"    // _PyArg_NoKwnames()
 #include "pycore_object.h"        // _PyObject_GC_TRACK(), _Py_FatalRefcountError()
 
 /*[clinic input]

Objects/typeobject.c

@@ -8,6 +8,7 @@
 #include "pycore_frame.h"         // _PyInterpreterFrame
 #include "pycore_long.h"          // _PyLong_IsNegative()
 #include "pycore_memoryobject.h"  // _PyMemoryView_FromBufferProc()
+#include "pycore_modsupport.h"    // _PyArg_NoKwnames()
 #include "pycore_moduleobject.h"  // _PyModule_GetDef()
 #include "pycore_object.h"        // _PyType_HasFeature()
 #include "pycore_pyerrors.h"      // _PyErr_Occurred()

Objects/weakrefobject.c

@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "pycore_modsupport.h"    // _PyArg_NoKwnames()
 #include "pycore_object.h"        // _PyObject_GET_WEAKREFS_LISTPTR()
 #include "pycore_weakref.h"       // _PyWeakref_GET_REF()
 #include "structmember.h"         // PyMemberDef