[mythtv] MacOS X MMX yuv420_2vuy Patch

[Nigel Pearson]

> it does "fix" the problem by allowing playback
> using the vectorized code but if you try to use the Quicktime
> conversion it still crashes.

	Got it. Intel QuickTime still crashes
on the (bad?) YUV420 that we are feeding it.
This adds working YUV2 which QuickTime likes.

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