gh-110964: Remove private _PyArg functions (#110966)

Move the following private functions and structures to
pycore_modsupport.h internal C API:

* _PyArg_BadArgument()
* _PyArg_CheckPositional()
* _PyArg_NoKeywords()
* _PyArg_NoPositional()
* _PyArg_ParseStack()
* _PyArg_ParseStackAndKeywords()
* _PyArg_Parser structure
* _PyArg_UnpackKeywords()
* _PyArg_UnpackKeywordsWithVararg()
* _PyArg_UnpackStack()
* _Py_ANY_VARARGS()

Changes:

* Python/getargs.h now includes pycore_modsupport.h to export
  functions.
* clinic.py now adds pycore_modsupport.h when one of these functions
  is used.
* Add pycore_modsupport.h includes when a C extension uses one of
  these functions.
* Define Py_BUILD_CORE_MODULE in C extensions which now include
  directly or indirectly (via code generated by Argument Clinic)
  pycore_modsupport.h:

  * _csv
  * _curses_panel
  * _dbm
  * _gdbm
  * _multiprocessing.posixshmem
  * _sqlite.row
  * _statistics
  * grp
  * resource
  * syslog

* _testcapi: bad_get() no longer uses METH_FASTCALL calling
  convention but METH_VARARGS. Replace _PyArg_UnpackStack() with
  PyArg_ParseTuple().
* _testcapi: add PYTESTCAPI_NEED_INTERNAL_API macro which is defined
  by _testcapi sub-modules which need the internal C API
  (pycore_modsupport.h): exceptions.c, float.c, vectorcall.c,
  watchers.c.
* Remove Include/cpython/modsupport.h header file.
  Include/modsupport.h no longer includes the removed header file.
* Fix mypy clinic.py

1 files changed, 0 insertions, 73 deletions

diff --git a/Include/cpython/modsupport.h b/Include/cpython/modsupport.h
deleted file mode 100644
index cfc2c2c..0000000
--- a/Include/cpython/modsupport.h
+++ /dev/null
@@ -1,73 +0,0 @@
-#ifndef Py_CPYTHON_MODSUPPORT_H
-#  error "this header file must not be included directly"
-#endif
-
-PyAPI_FUNC(int) _PyArg_UnpackStack(
-    PyObject *const *args,
-    Py_ssize_t nargs,
-    const char *name,
-    Py_ssize_t min,
-    Py_ssize_t max,
-    ...);
-
-PyAPI_FUNC(int) _PyArg_NoKeywords(const char *funcname, PyObject *kwargs);
-PyAPI_FUNC(int) _PyArg_NoPositional(const char *funcname, PyObject *args);
-#define _PyArg_NoKeywords(funcname, kwargs) \
-    ((kwargs) == NULL || _PyArg_NoKeywords((funcname), (kwargs)))
-#define _PyArg_NoPositional(funcname, args) \
-    ((args) == NULL || _PyArg_NoPositional((funcname), (args)))
-
-#define _Py_ANY_VARARGS(n) ((n) == PY_SSIZE_T_MAX)
-
-PyAPI_FUNC(void) _PyArg_BadArgument(const char *, const char *, const char *, PyObject *);
-PyAPI_FUNC(int) _PyArg_CheckPositional(const char *, Py_ssize_t,
-                                       Py_ssize_t, Py_ssize_t);
-#define _PyArg_CheckPositional(funcname, nargs, min, max) \
-    ((!_Py_ANY_VARARGS(max) && (min) <= (nargs) && (nargs) <= (max)) \
-     || _PyArg_CheckPositional((funcname), (nargs), (min), (max)))
-
-typedef struct _PyArg_Parser {
-    int initialized;
-    const char *format;
-    const char * const *keywords;
-    const char *fname;
-    const char *custom_msg;
-    int pos;            /* number of positional-only arguments */
-    int min;            /* minimal number of arguments */
-    int max;            /* maximal number of positional arguments */
-    PyObject *kwtuple;  /* tuple of keyword parameter names */
-    struct _PyArg_Parser *next;
-} _PyArg_Parser;
-
-PyAPI_FUNC(int) _PyArg_ParseTupleAndKeywordsFast(PyObject *, PyObject *,
-                                                 struct _PyArg_Parser *, ...);
-PyAPI_FUNC(int) _PyArg_ParseStack(
-    PyObject *const *args,
-    Py_ssize_t nargs,
-    const char *format,
-    ...);
-PyAPI_FUNC(int) _PyArg_ParseStackAndKeywords(
-    PyObject *const *args,
-    Py_ssize_t nargs,
-    PyObject *kwnames,
-    struct _PyArg_Parser *,
-    ...);
-PyAPI_FUNC(PyObject * const *) _PyArg_UnpackKeywords(
-        PyObject *const *args, Py_ssize_t nargs,
-        PyObject *kwargs, PyObject *kwnames,
-        struct _PyArg_Parser *parser,
-        int minpos, int maxpos, int minkw,
-        PyObject **buf);
-
-PyAPI_FUNC(PyObject * const *) _PyArg_UnpackKeywordsWithVararg(
-        PyObject *const *args, Py_ssize_t nargs,
-        PyObject *kwargs, PyObject *kwnames,
-        struct _PyArg_Parser *parser,
-        int minpos, int maxpos, int minkw,
-        int vararg, PyObject **buf);
-
-#define _PyArg_UnpackKeywords(args, nargs, kwargs, kwnames, parser, minpos, maxpos, minkw, buf) \
-    (((minkw) == 0 && (kwargs) == NULL && (kwnames) == NULL && \
-      (minpos) <= (nargs) && (nargs) <= (maxpos) && (args) != NULL) ? (args) : \
-     _PyArg_UnpackKeywords((args), (nargs), (kwargs), (kwnames), (parser), \
-                           (minpos), (maxpos), (minkw), (buf)))