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"
 
-#ifdef _MSC_VER
-# pragma optimize("t", on)
-# include <emmintrin.h>
-#endif
-
 #ifndef HAVE_FLOORF
 # define HAVE_FLOORF 0
 #endif