[mythtv] MMX patch on MacOS X

[Nigel Pearson]

> While trying to build yesterdays CVS on MacOS X, I got linker errors 
> about a missing definition of mm_support in filter_crop.c and 
> filter_quickdnr.c. I added the following lines to both files and got 
> them to link OK, but I have no idea whether this is an acceptable 
> solution:
>
>  #define emms()  do {} while (0)
>  int mm_support(void) { return 0; }

	That does work, but since lots of other filters also
define and use something similar, I think we can do better.
I spent the weekend redesigning all this stuff,
but then Mino Taoyama came up with a much simpler solution
for these two filters, so I checked that in for now.

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