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arm: Add a no-op define of __builtin_prefetch for MSVC

Both GCC and RVCT/ARMCC support __builtin_prefetch, but MSVC
doesn't.

Change-Id: I44e1eecead61bc88d8fdfd3fef03d76d4f5afe08

--- a/vp8/common/arm/neon/sixtappredict_neon.c

+++ b/vp8/common/arm/neon/sixtappredict_neon.c

@@ -10,6 +10,10 @@

 #include <arm_neon.h>

+#ifdef _MSC_VER

+#define __builtin_prefetch(x)

+#endif

+

 static const int8_t vp8_sub_pel_filters[8][8] = {

     {0,  0,  128,   0,   0, 0, 0, 0},  /* note that 1/8 pel positionyys are */

     {0, -6,  123,  12,  -1, 0, 0, 0},  /*    just as per alpha -0.5 bicubic */

--- a/vp8/common/arm/neon/variance_neon.c

+++ b/vp8/common/arm/neon/variance_neon.c

@@ -10,6 +10,10 @@

 #include <arm_neon.h>

+#ifdef _MSC_VER

+#define __builtin_prefetch(x)

+#endif

+

 unsigned int vp8_variance16x16_neon(

         const unsigned char *src_ptr,

         int source_stride,