patch 8.2.1503: Vim9: error for autocmd defined in :def in legacy script

Problem:    Vim9: error for an autocmd defined in a :def function in legacy
            Vim script.
Solution:   Don't check the variable type. (closes #6758)

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1503,
 /**/
     1502,
 /**/