[mythtv] [PATCH] Remove mm_support for non MMX builds

[Nigel Pearson]

> Here is a small patch to remove the dependency on the mm_support 
> function for non-MMX builds.
>
> I was having a problem with MacOS X builds since the code in the 
> quickdnr and crop filters would fail to link because mm_support was 
> not defined.  I just put #ifdef MMX around the code.

	Thanks for that, Taoyama-san.

	I have committed that with some small changes
(took out redundant MMX functions that will now
  never be called, slight formatting changes)

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