Issue #29083: Fixed the declaration of some public API functions.

PyArg_VaParse() and PyArg_VaParseTupleAndKeywords() were not available in
limited API.  PyArg_ValidateKeywordArguments(), PyArg_UnpackTuple() and
Py_BuildValue() were not available in limited API of version < 3.3 when
PY_SSIZE_T_CLEAN is defined.

diff --cc Include/modsupport.h
index e464a1cad00efdc19b6a874f37405466f50146b7,86719c6e9293057237b90ba076d416cd94b6cf25..7f4160e5bac63ca4b047c1884b7a9657f20ea4a4
--- 1/Include/modsupport.h
--- 2/Include/modsupport.h
+++ b/Include/modsupport.h
@@@ -15,15 -15,10 +15,13 @@@ extern "C" 
  #define PyArg_Parse                     _PyArg_Parse_SizeT
  #define PyArg_ParseTuple                _PyArg_ParseTuple_SizeT
  #define PyArg_ParseTupleAndKeywords     _PyArg_ParseTupleAndKeywords_SizeT
- #ifndef Py_LIMITED_API
  #define PyArg_VaParse                   _PyArg_VaParse_SizeT
  #define PyArg_VaParseTupleAndKeywords   _PyArg_VaParseTupleAndKeywords_SizeT
- #endif /* !Py_LIMITED_API */
  #define Py_BuildValue                   _Py_BuildValue_SizeT
  #define Py_VaBuildValue                 _Py_VaBuildValue_SizeT
 +#ifndef Py_LIMITED_API
 +#define _Py_VaBuildStack                _Py_VaBuildStack_SizeT
 +#endif
  #else
  #ifndef Py_LIMITED_API
  PyAPI_FUNC(PyObject *) _Py_VaBuildValue_SizeT(const char *, va_list);
@@@ -46,35 -39,12 +48,31 @@@ PyAPI_FUNC(int) PyArg_ValidateKeywordAr
  PyAPI_FUNC(int) PyArg_UnpackTuple(PyObject *, const char *, Py_ssize_t, Py_ssize_t, ...);
  PyAPI_FUNC(PyObject *) Py_BuildValue(const char *, ...);
  PyAPI_FUNC(PyObject *) _Py_BuildValue_SizeT(const char *, ...);
- #endif
+ 
 +
  #ifndef Py_LIMITED_API
 -PyAPI_FUNC(int) _PyArg_NoKeywords(const char *funcname, PyObject *kw);
 +PyAPI_FUNC(int) _PyArg_UnpackStack(
 +    PyObject **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_NoStackKeywords(const char *funcname, PyObject *kwnames);
  PyAPI_FUNC(int) _PyArg_NoPositional(const char *funcname, PyObject *args);
- 
- PyAPI_FUNC(int) PyArg_VaParse(PyObject *, const char *, va_list);
- PyAPI_FUNC(int) PyArg_VaParseTupleAndKeywords(PyObject *, PyObject *,
-                                                   const char *, char **, va_list);
  #endif
 +
  PyAPI_FUNC(PyObject *) Py_VaBuildValue(const char *, va_list);
 +#ifndef Py_LIMITED_API
 +PyAPI_FUNC(PyObject **) _Py_VaBuildStack(
 +    PyObject **small_stack,
 +    Py_ssize_t small_stack_len,
 +    const char *format,
 +    va_list va,
 +    Py_ssize_t *p_nargs);
 +#endif
  
  #ifndef Py_LIMITED_API
  typedef struct _PyArg_Parser {

diff --cc Misc/NEWS
index 6ce2e3d791cc02135aa9bd790cc14e19aeb6d9f5,faab4df9910bb4269e612abacf7f9c443b71b1cb..34d45651af8bbf487a33b624ee403f8f839e2ef0
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -623,9 -143,12 +623,15 @@@ Window
  C API
  -----
  
+ - Issue #29083: Fixed the declaration of some public API functions.
+   PyArg_VaParse() and PyArg_VaParseTupleAndKeywords() were not available in
+   limited API.  PyArg_ValidateKeywordArguments(), PyArg_UnpackTuple() and
+   Py_BuildValue() were not available in limited API of version < 3.3 when
+   PY_SSIZE_T_CLEAN is defined.
+ 
 +- Issue #28769: The result of PyUnicode_AsUTF8AndSize() and PyUnicode_AsUTF8()
 +  is now of type "const char *" rather of "char *".
 +
  - Issue #29058: All stable API extensions added after Python 3.2 are now
    available only when Py_LIMITED_API is set to the PY_VERSION_HEX value of
    the minimum Python version supporting this API.