vpx_integer: Use inttypes.h in MSVC (2013 and later).

Change-Id: I2c47f0ab13de82de8833c3f134e5f3c74394374f

vpx/vpx_integer.h

diff --git a/vpx/vpx_integer.h b/vpx/vpx_integer.h
index dfa361b..258618b 100644
--- a/vpx/vpx_integer.h
+++ b/vpx/vpx_integer.h
@@ -48,7 +48,7 @@
 #endif
 
 /* VS2010 defines stdint.h, but not inttypes.h */
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) && _MSC_VER < 1800
 #define PRId64 "I64d"
 #else
 #include <inttypes.h>