patch 8.0.1284: loading file type detection slows down startup

Problem:    Loading file type detection slows down startup.
Solution:   Store the last pattern of an autocommand event to make appending
            quicker.

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1284,
 /**/
     1283,
 /**/