bpo-39026: Fix Python.h when building with Xcode (pythonGH-29488)

Fix Python.h to build C extensions with Xcode: remove a relative
include from Include/cpython/pystate.h.

Author: vstinner

Include/Python.h

@@ -72,6 +72,7 @@
 #include "sliceobject.h"
 #include "cpython/cellobject.h"
 #include "iterobject.h"
+#include "cpython/initconfig.h"
 #include "pystate.h"
 #include "cpython/genobject.h"
 #include "descrobject.h"
@@ -83,7 +84,6 @@
 #include "cpython/pytime.h"
 #include "codecs.h"
 #include "pyerrors.h"
-#include "cpython/initconfig.h"
 #include "pythread.h"
 #include "cpython/context.h"
 #include "modsupport.h"

Include/cpython/pystate.h

@@ -2,8 +2,6 @@
 #  error "this header file must not be included directly"
 #endif
 
-#include "cpython/initconfig.h"
-
 PyAPI_FUNC(int) _PyInterpreterState_RequiresIDRef(PyInterpreterState *);
 PyAPI_FUNC(void) _PyInterpreterState_RequireIDRef(PyInterpreterState *, int);
 

Misc/NEWS.d/next/C API/2021-11-09-15-42-11.bpo-39026.sUnYWn.rst

@@ -0,0 +1,2 @@
+Fix Python.h to build C extensions with Xcode: remove a relative include
+from ``Include/cpython/pystate.h``.