patch 8.1.0018: using "gn" may select wrong text when wrapping

Problem:    Using "gn" may select wrong text when wrapping.
Solution:   Avoid wrapping when searching forward. (Christian Brabandt)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    18,
 /**/
     17,
 /**/