gh-111903: Update AC to support "pycore_critical_section.h" header

Author: corona10

Modules/_functoolsmodule.c

@@ -1,6 +1,5 @@
 #include "Python.h"
 #include "pycore_call.h"          // _PyObject_CallNoArgs()
-#include "pycore_critical_section.h"  // Py_BEGIN_CRITICAL_SECTION
 #include "pycore_dict.h"          // _PyDict_Pop_KnownHash()
 #include "pycore_long.h"          // _PyLong_GetZero()
 #include "pycore_moduleobject.h"  // _PyModule_GetState()

Modules/_io/bufferedio.c

@@ -10,7 +10,6 @@
 #include "Python.h"
 #include "pycore_bytesobject.h"   // _PyBytes_Join()
 #include "pycore_call.h"          // _PyObject_CallNoArgs()
-#include "pycore_critical_section.h"  // Py_BEGIN_CRITICAL_SECTION()
 #include "pycore_object.h"        // _PyObject_GC_UNTRACK()
 #include "pycore_pyerrors.h"      // _Py_FatalErrorFormat()
 #include "pycore_pylifecycle.h"   // _Py_IsInterpreterFinalizing()

Modules/_io/clinic/bufferedio.c.h

@@ -5306,6 +5306,8 @@ def at_critical_section(self, *args: str) -> None:
             fail("Up to 2 critical section variables are supported")
         self.target_critical_section.extend(args)
         self.critical_section = True
+        if self.critical_section:
+            clinic.add_include('pycore_critical_section.h', 'Py_BEGIN_CRITICAL_SECTION()')
 
     def at_staticmethod(self) -> None:
         if self.kind is not CALLABLE: