gh-106320: Remove private _PyLong_FileDescriptor_Converter() (#108503)

Move the private _PyLong converter functions to the internal C API

* _PyLong_FileDescriptor_Converter(): moved to pycore_fileutils.h
* _PyLong_Size_t_Converter(): moved to pycore_long.h

Argument Clinic now emits includes for pycore_fileutils.h and
pycore_long.h when these functions are used.

Author: vstinner

Include/cpython/fileobject.h

@@ -15,5 +15,3 @@ typedef PyObject * (*Py_OpenCodeHookFunction)(PyObject *, void *);
 PyAPI_FUNC(PyObject *) PyFile_OpenCode(const char *utf8path);
 PyAPI_FUNC(PyObject *) PyFile_OpenCodeObject(PyObject *path);
 PyAPI_FUNC(int) PyFile_SetOpenCodeHook(Py_OpenCodeHookFunction hook, void *userData);
-
-PyAPI_FUNC(int) _PyLong_FileDescriptor_Converter(PyObject *, void *);

Include/cpython/longobject.h

@@ -2,8 +2,6 @@
 #  error "this header file must not be included directly"
 #endif
 
-PyAPI_FUNC(int) _PyLong_Size_t_Converter(PyObject *, void *);
-
 PyAPI_FUNC(PyObject*) PyLong_FromUnicodeObject(PyObject *u, int base);
 
 /* _PyLong_Sign.  Return 0 if v is 0, -1 if v < 0, +1 if v > 0.

Include/internal/pycore_fileutils.h

@@ -312,6 +312,9 @@ extern HRESULT PathCchSkipRoot(const wchar_t *pszPath, const wchar_t **ppszRootE
 #  define _Py_END_SUPPRESS_IPH
 #endif /* _MSC_VER >= 1900 */
 
+// Export for 'select' shared extension (Argument Clinic code)
+PyAPI_FUNC(int) _PyLong_FileDescriptor_Converter(PyObject *, void *);
+
 #ifdef __cplusplus
 }
 #endif

Include/internal/pycore_long.h

@@ -187,11 +187,21 @@ extern char* _PyLong_FormatBytesWriter(
     int alternate);
 
 // Argument converters used by Argument Clinic
+
+// Export for 'select' shared extension (Argument Clinic code)
 PyAPI_FUNC(int) _PyLong_UnsignedShort_Converter(PyObject *, void *);
+
+// Export for '_testclinic' shared extension (Argument Clinic code)
 PyAPI_FUNC(int) _PyLong_UnsignedInt_Converter(PyObject *, void *);
+
+// Export for '_blake2' shared extension (Argument Clinic code)
 PyAPI_FUNC(int) _PyLong_UnsignedLong_Converter(PyObject *, void *);
+
+// Export for '_blake2' shared extension (Argument Clinic code)
 PyAPI_FUNC(int) _PyLong_UnsignedLongLong_Converter(PyObject *, void *);
 
+// Export for '_testclinic' shared extension (Argument Clinic code)
+PyAPI_FUNC(int) _PyLong_Size_t_Converter(PyObject *, void *);
 
 /* Long value tag bits:
  * 0-1: Sign bits value = (1-sign), ie. negative=2, positive=0, zero=1.

Modules/clinic/_winapi.c.h

@@ -1,5 +1,9 @@
 /* fcntl module */
 
+#ifndef Py_BUILD_CORE_BUILTIN
+#  define Py_BUILD_CORE_MODULE 1
+#endif
+
 #include "Python.h"
 
 #ifdef HAVE_SYS_FILE_H