Fix insertion order of add-hook! when appending

When appending multiple functions to a hook(s) with add-hook!, insertion
order was not preserved. e.g.

  => (add-hook! :append 'some-mode-hook #'(hook-1 hook-2))
  => some-mode-hook
  (hook-2 hook-1)

core/core-lib.el

@@ -304,7 +304,7 @@ Body forms can access the hook's arguments through the let-bound variable
                     `(remove-hook ',hook ,fn ,local-p)
                   `(add-hook ',hook ,fn ,append-p ,local-p))
                 forms)))
-      `(progn ,@forms))))
+      `(progn ,@(if append-p (nreverse forms) forms)))))
 
 (defmacro remove-hook! (&rest args)
   "Convenience macro for `remove-hook'. Takes the same arguments as