libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_systemdependent.h

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef VP9_COMMON_VP9_SYSTEMDEPENDENT_H_
 #define VP9_COMMON_VP9_SYSTEMDEPENDENT_H_
 
+#include "vpx_ports/msvc.h"
+
 #ifdef _MSC_VER
 # include <math.h>  // the ceil() definition must precede intrin.h
 # if _MSC_VER > 1310 && (defined(_M_X64) || defined(_M_IX86))
 #  include <intrin.h>
-#  define USE_MSC_INTRIN
+#  define USE_MSC_INTRINSICS
 # endif
-#if _MSC_VER < 1900
-# define snprintf _snprintf
-#endif
 #endif
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 #include "./vpx_config.h"
 #if ARCH_X86 || ARCH_X86_64
 void vpx_reset_mmx_state(void);
 #define vp9_clear_system_state() vpx_reset_mmx_state()
@@ skipping 10 matching lines @@
     return (int)floor(x + 0.5);
 }
 #endif
 
 // use GNU builtins where available.
 #if defined(__GNUC__) && \
     ((__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)
 static INLINE int get_msb(unsigned int n) {
   return 31 ^ __builtin_clz(n);
 }
-#elif defined(USE_MSC_INTRIN)
+#elif defined(USE_MSC_INTRINSICS)
 #pragma intrinsic(_BitScanReverse)
 
 static INLINE int get_msb(unsigned int n) {
   unsigned long first_set_bit;
   _BitScanReverse(&first_set_bit, n);
   return first_set_bit;
 }
-#undef USE_MSC_INTRIN
+#undef USE_MSC_INTRINSICS
 #else
 // Returns (int)floor(log2(n)). n must be > 0.
 static INLINE int get_msb(unsigned int n) {
   int log = 0;
   unsigned int value = n;
   int i;
 
   for (i = 4; i >= 0; --i) {
     const int shift = (1 << i);
     const unsigned int x = value >> shift;
     if (x != 0) {
       value = x;
       log += shift;
     }
   }
   return log;
 }
 #endif
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_COMMON_VP9_SYSTEMDEPENDENT_H_