[Liboil] [patch] sse2 optimized sad8x8_u8_avg

[Will Dyson]

Hi,

Here is an sse2 optimized version of sad8x8_u8_avg.

On an Athlon64 it measures about 2.6 times the speed of the ref implementation.
On a PentiumM laptop, it measures about 1.8 times the speed of the ref
implementation.

-- 
Will Dyson
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