patch 8.0.0618: NFA regex engine handles [0-z] incorrectly

Problem:    NFA regex engine handles [0-z] incorrectly.
Solution:   Return at the right point. (James McCoy, closes #1703)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    618,
 /**/
     617,
 /**/