[mythtv] [PATCH]Fix MacOS X build of mythui

[Nigel Pearson]

> Small patch to add carbon headers and framework.

	Thanks for that, Mino. (I had a similar patch in
my local tree for a few days, but forgot to commit).

	I have committed a patch for HIToolbox/Menus.h
instead of your Carbon/Carbon.h.

(No point including all of Carbon for one symbol,
  but it does mean I had to add another compile flag)

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