patch 8.2.4688: new regexp engine does not give an error for "\%v"

Problem:    New regexp engine does not give an error for "\%v".
Solution:   Check for a value argument. (issue #10079)
diff --git a/src/version.c b/src/version.c
index 23dede0..9b1d56a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4688,
+/**/
     4687,
 /**/
     4686,