Fix --remove-files in update/append mode.

* src/update.c (update_archive): Call finish_deferred_unlinks when
done.

src/update.c

@@ -230,5 +230,6 @@ update_archive (void)
 
   write_eot ();
   close_archive ();
+  finish_deferred_unlinks ();
   names_notfound ();
 }