ext/gd: Drop useless and doubtful MSVC specific code (libgd/libgd@f1480ab)

Author: hyh19962008

ext/gd/libgd/gd_interpolation.c

@@ -62,11 +62,6 @@
 #include "gdhelpers.h"
 #include "gd_intern.h"
 
-#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
-# pragma optimize("t", on)
-# include <emmintrin.h>
-#endif
-
 #ifndef MIN
 #define MIN(a,b) ((a)<(b)?(a):(b))
 #endif