[mythtv] MacOS X MMX yuv420_2vuy Patch

[Nigel Pearson]

> I think I know what is happening.  My lack
> of experience in MMX programming is showing.

	Mine too :-)

...
> The patch just adds a call to emms()
> to the end of the MMX conversion routine.
>
> Let me know if it works.

	It does. Thanks! Will commit soon.

--
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