patch 8.2.4264: Vim9: can use old style autoload function name

Problem:    Vim9: can use old style autoload function name.
Solution:   Give an error for old style autoload function name.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4264,
 /**/
     4263,
 /**/