configure: Make compilable with VS2015 (missing hunk)

This hunk was missing in the github pull request when i downloaded it,
but is needed
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavutil/internal.h

@@ -164,7 +164,7 @@
 
 #include "libm.h"
 
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) && _MSC_VER < 1900
 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
 #endif