patch 8.2.4584: error for using autoload function in custom completion

Problem:    Error for using autoload function in custom completion.
Solution:   Do not check for errors when using an autoload function.
            (closes #9962)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4584,
 /**/
     4583,
 /**/