patch 8.2.3924: Vim9: no error if something follows :enddef

Problem:    Vim9: no error if something follows :enddef in a nested function.
Solution:   Give an error.  Move common code to a function.
diff --git a/src/version.c b/src/version.c
index 5d22d98..90bd422 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3924,
+/**/
     3923,
 /**/
     3922,