libvpx: Pull from upstream

source/libvpx/vpx_ports/x86.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.
  */
 
@@ skipping 118 matching lines @@
     __asm _emit 0x0f __asm _emit 0x01 __asm _emit 0xd0
     mov eax_, eax
     mov edx_, edx
   }
   return ((uint64_t)edx_ << 32) | eax_;
 }
 #else
 #define xgetbv() 0U  // no AVX for older x64 or unrecognized toolchains.
 #endif
 
+#if defined(_MSC_VER) && _MSC_VER >= 1700
+#include <windows.h>
+#if WINAPI_FAMILY_PARTITION(WINAPI_FAMILY_APP)
+#define getenv(x) NULL
+#endif
+#endif
+
 #define HAS_MMX     0x01
 #define HAS_SSE     0x02
 #define HAS_SSE2    0x04
 #define HAS_SSE3    0x08
 #define HAS_SSSE3   0x10
 #define HAS_SSE4_1  0x20
 #define HAS_AVX     0x40
 #define HAS_AVX2    0x80
 #ifndef BIT
 #define BIT(n) (1<<n)
@@ skipping 145 matching lines @@
 }
 
 
 extern void vpx_reset_mmx_state(void);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VPX_PORTS_X86_H_