Replaced the intrinsics header with the single header that includes all intrinsics so we can use AVX, etc.

include/SDL_cpuinfo.h

@@ -56,21 +56,10 @@
 #undef pixel
 #endif
 #endif
-#ifdef __MMX__
-#include <mmintrin.h>
-#endif
 #ifdef __3dNOW__
 #include <mm3dnow.h>
 #endif
-#ifdef __SSE__
-#include <xmmintrin.h>
-#endif
-#ifdef __SSE2__
-#include <emmintrin.h>
-#endif
-#ifdef __SSE3__
-#include <pmmintrin.h>
-#endif
+#include <immintrin.h>
 #endif
 
 #include "begin_code.h"