updated for version 7.4.499

Problem:    substitute() can be slow with long strings.
Solution:   Store a pointer to the end, instead of calling strlen() every
            time. (Ozaki Kiichi)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    499,
 /**/
     498,
 /**/