[O] Zero Warnings against Emacs-24

[Martyn Jago]

It is extremely good to see Org-mode builds against Emacs-24 with zero
warnings. 

(with make up1 autoloads)

Org-mode rocks, /and/ plays nicely with Emacs.

Thanks Bastien, Achim, and Maintainers ~ I for one think such attention
to detail is a real sign of quality.

Also with zero test failures on my system - this must be a good sign for
Emacs-24 up-coming release.

Thanks, Martyn