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[smooth] Detect SSE2 with MSVC for x86

MSVC does not set `__SSE2__`. Instead one must check whether `_M_IX86_FP` is
defined and greater than or equal to 2.

* src/smooth/ftgrays.c (FT_SSE2): New macro.
Use it where appropriate.

git/fs: mount .git/fs: mount/attach disallowed

--- a/src/smooth/ftgrays.c

+++ b/src/smooth/ftgrays.c

@@ -999,10 +999,17 @@

    *

    * For other cases, using binary splits is actually slightly faster.

    */

-#if defined( __SSE2__ )    || \

-    defined( __x86_64__ )  || \

+#if defined( __SSE2__ )                          || \

+    defined( __x86_64__ )                        || \

+    defined( _M_AMD64 )                          || \

+    ( defined( _M_IX86_FP ) && _M_IX86_FP >= 2 )

+#  define FT_SSE2 1

+#else

+#  define FT_SSE2 0

+#endif

+

+#if FT_SSE2                || \

     defined( __aarch64__ ) || \

-    defined( _M_AMD64 )    || \

     defined( _M_ARM64 )

 #  define BEZIER_USE_DDA  1

 #else

@@ -1022,7 +1029,7 @@

 #if BEZIER_USE_DDA

-#ifdef __SSE2__

+#if FT_SSE2

 #  include <emmintrin.h>

 #endif

@@ -1135,7 +1142,7 @@

      *             = (B << (33 - N)) + (A << (32 - 2*N))

      */

-#ifdef __SSE2__

+#if FT_SSE2

     /* Experience shows that for small shift values, */

     /* SSE2 is actually slower.                      */

     if ( shift > 2 )

@@ -1192,7 +1199,7 @@

       return;

     }

-#endif  /* __SSE2__ */

+#endif  /* FT_SSE2 */

     rx = LEFT_SHIFT( ax, 33 - 2 * shift );

     ry = LEFT_SHIFT( ay, 33 - 2 * shift );