patch 8.0.1517: invalid memory acces with pattern using look-behind match

Problem:    Invalid memory acces with pattern using look-behind match.
            (Dominique Pelle)
Solution:   Get a pointer to the right line.

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1517,
 /**/
     1516,
 /**/