[mythtv] Denoise3D MMX patch, round 2

[Andrew Mahone]

New MMX support patch for Denoise3D, using mmx.h and no GCC3 builtins.  On my 
system, yields about 13% speed increase, according to the timing code I've 
added (use -DTIME_FILTER to compile it in).  It's also processed with indent, 
this time with 4-space indents.  I have some ideas to get a little more speed 
out of it, but it's 5am here, and attempting to actually implement any of 
them would be almost certain disaster.
-- 
  Andrew Mahone
  andrewmahone AT eml DOT cc
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