Added arch-tag to org-irc.el and org-mac-message.el.

See Miles Bader messages on emacs-diffs list:
<E1Ja6oD-0000ue-K1@cvs.savannah.gnu.org>
<E1Ja6oD-0000ui-Pu@cvs.savannah.gnu.org>

org-irc.el

@@ -242,4 +242,5 @@ explicit port set then return the erc default."
 
 (provide 'org-irc)
 
+;; arch-tag: 018d7dda-53b8-4a35-ba92-6670939e525a
 ;;; org-irc.el ends here

org-mac-message.el

@@ -74,4 +74,5 @@ end tell")))
 
 (provide 'org-mac-message)
 
+;; arch-tag: 3806d0c1-abe1-4db6-9c31-f3ed7d4a9b32
 ;;; org-mac-message.el ends here