only define MS_WIN64

Author: GalaxySnail

PC/pyconfig.h

@@ -213,18 +213,10 @@ typedef int pid_t;
 /* mingw and mingw-w64 define __MINGW32__ */
 #ifdef __MINGW32__
 
-#if !defined(MS_WIN64) && defined(_WIN64)
+#ifdef _WIN64
 #define MS_WIN64
 #endif
 
-#if !defined(MS_WIN32) && defined(_WIN32)
-#define MS_WIN32
-#endif
-
-#if !defined(MS_WINDOWS) && defined(MS_WIN32)
-#define MS_WINDOWS
-#endif
-
 #endif /* __MINGW32__*/
 
 /* ------------------------------------------------------------------------*/