patch 8.2.4330: Vim9: no error if script imports itself

Problem:    Vim9: no error if script imports itself.
Solution:   Give an error when a script imports itself.

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4330,
 /**/
     4329,
 /**/