gh-152433: Windows: fix ctypes MemoryError in UWP build

UWP does not allow allocating memory with code execution permissions.

Author: thexai

Modules/_ctypes/malloc_closure.c

@@ -70,8 +70,8 @@ static void more_core(void)
 #ifdef MS_WIN32
     item = (ITEM *)VirtualAlloc(NULL,
                                            count * sizeof(ITEM),
-                                           MEM_COMMIT,
-                                           PAGE_EXECUTE_READWRITE);
+                                           MEM_COMMIT | MEM_RESERVE,
+                                           PAGE_READWRITE);
     if (item == NULL)
         return;
 #else