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.
diff --git a/src/version.c b/src/version.c
index 814934d..8cb6cb8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    188,
+/**/
     187,
 /**/
     186,