patch 8.2.4247: stack corruption when looking for spell suggestions

Problem:    Stack corruption when looking for spell suggestions.
Solution:   Prevent the depth increased too much.  Add a five second time
            limit to finding suggestions.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4247,
 /**/
     4246,
 /**/