Don't #define snprintf in VS 2015 or higher.

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_
 
 #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
 # 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()
 #else
@@ skipping 42 matching lines @@
   }
   return log;
 }
 #endif
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_COMMON_VP9_SYSTEMDEPENDENT_H_