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Fix compiling error in MSVS

Need to include math.h before tmmintrin.h in some versions of MSVS.

Change-Id: Ia6b83ae599316887ecf30c4e4b9e4355fb8a4219

--- a/vp9/common/x86/vp9_idct_intrin_ssse3.c

+++ b/vp9/common/x86/vp9_idct_intrin_ssse3.c

@@ -8,6 +8,11 @@

  *  be found in the AUTHORS file in the root of the source tree.

  */

+#if defined(_MSC_VER) && _MSC_VER <= 1500

+// Need to include math.h before calling tmmintrin.h/intrin.h

+// in certain versions of MSVS.

+#include <math.h>

+#endif

 #include <tmmintrin.h>  // SSSE3

 #include "vp9/common/x86/vp9_idct_intrin_sse2.h"