vc9 build fix

Author: smalyshev

Zend/zend_config.w32.h

@@ -48,7 +48,9 @@ typedef unsigned int uint;
 #define istdiostream stdiostream
 
 #define snprintf _snprintf
+#if _MSC_VER < 1500
 #define vsnprintf _vsnprintf
+#endif
 #define strcasecmp(s1, s2) stricmp(s1, s2)
 #define strncasecmp(s1, s2, n) strnicmp(s1, s2, n)
 #define zend_isinf(a)	((_fpclass(a) == _FPCLASS_PINF) || (_fpclass(a) == _FPCLASS_NINF))