Don't #define snprintf in VS 2015 or higher.
In VS 2015 and higher snprintf is supplied and therefore vsnprintf
doesn't need to be defined. This also avoids problems caused by
_snprintf being different from snprintf.
This fixes a build break with VS 2015 and improves security.
R=tomfinegan@chromium.org
BUG=440500
Review URL: https://codereview.chromium.org/1055603003
diff --git a/source/libvpx/vp9/common/vp9_systemdependent.h b/source/libvpx/vp9/common/vp9_systemdependent.h
index e971158..161c381 100644
--- a/source/libvpx/vp9/common/vp9_systemdependent.h
+++ b/source/libvpx/vp9/common/vp9_systemdependent.h
@@ -17,8 +17,10 @@
# include <intrin.h>
# define USE_MSC_INTRIN
# endif
+#if _MSC_VER < 1900
# define snprintf _snprintf
#endif
+#endif
#ifdef __cplusplus
extern "C" {
