patch 8.0.0188: redrawing for 'cursorbind' is inefficient

Problem:    Using NOT_VALID for redraw_later() to update the cursor
            line/column highlighting is not efficient.
Solution:   Call validate_cursor() when 'cul' or 'cuc' is set.

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    188,
 /**/
     187,
 /**/