(svn r19158) -Fix (r19149): MSVC 64 bits compile warning

src/string.cpp

@@ -253,7 +253,7 @@ int CDECL vsnprintf(char *str, size_t size, const char *format, va_list ap)
 	/* The buffer is too small for _vsnprintf to write the
 	 * null-terminator at its end and return size. */
 	str[size - 1] = '\0';
-	return size;
+	return (int)size;
 }
 #endif /* _MSC_VER */