Get Microsoft's preprocessor symbols in there

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401479

include/SDL_endian.h

@@ -33,9 +33,9 @@
 
 #ifndef SDL_BYTEORDER	/* Not defined in SDL_config.h? */
 #if defined(__hppa__) || \
-    defined(__m68k__) || defined(mc68000) || \
+    defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
     (defined(__MIPS__) && defined(__MISPEB__)) || \
-    defined(__ppc__) || defined(__POWERPC__) || \
+    defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
     defined(__sparc__)
 #define SDL_BYTEORDER	SDL_BIG_ENDIAN
 #else