gh-114626: Add again _PyCFunctionFastWithKeywords name (GH-115561)

Keep the old private _PyCFunctionFastWithKeywords name (Python 3.7)
as an alias to the new public name PyCFunctionFastWithKeywords
(Python 3.13a4).

_PyCFunctionWithKeywords doesn't exist in Python 3.13a3, whereas
_PyCFunctionFastWithKeywords was removed in Python 3.13a4.

Author: vstinner

Include/methodobject.h

@@ -31,7 +31,7 @@ typedef PyObject *(*PyCMethod)(PyObject *, PyTypeObject *, PyObject *const *,
 // Note that the underscore-prefixed names were documented in public docs;
 // people may be using them.
 typedef PyCFunctionFast _PyCFunctionFast;
-typedef PyCFunctionWithKeywords _PyCFunctionWithKeywords;
+typedef PyCFunctionFastWithKeywords _PyCFunctionFastWithKeywords;
 
 // Cast an function to the PyCFunction type to use it with PyMethodDef.
 //

Misc/NEWS.d/next/C API/2024-02-16-15-56-53.gh-issue-114626.ie2esA.rst

@@ -0,0 +1,4 @@
+Add again ``_PyCFunctionFastWithKeywords`` name, removed in Python 3.13
+alpha 4 by mistake.  Keep the old private ``_PyCFunctionFastWithKeywords``
+name (Python 3.7) as an alias to the new public name
+``PyCFunctionFastWithKeywords`` (Python 3.13a4). Patch by Victor Stinner.