Pascal Massimino 9102a7b63d Add a WebPExtractAlpha function to dsp
This is the opposite of WebPDispatchAlpha

+ Implement the SSE2 version

(cherry picked from commit cddd33405055d70e5aab7b2aabaf1970522dd2e4)

Conflicts:
	src/dsp/alpha_processing_sse2.c

Change-Id: I0c297309255f508c5261da8aad01f7e57f924d6c
2014-10-14 12:02:16 +02:00
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