MSVC compilation fix for vsnprintf()

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@3362 8092fc87-c524-0410-9efc-e669fe64eaf9

sc2/src/port.h

@@ -142,6 +142,7 @@ typedef unsigned short mode_t;
 
 // String formatting
 #ifdef _MSC_VER
+#	include <stdarg.h>
 // Defined in port.c
 int snprintf(char *str, size_t size, const char *format, ...);
 int vsnprintf(char *str, size_t size, const char *format, va_list args);