[FFmpeg-devel] Updated VP6A threading patch set

[Ben Jackson]

Minor changes from rev 1:

* Cleaned up a place where golden_frame was not set explicitly (no
  change in behavior but more clear as to intent)
* Moved setting of alpha_context current frame up in case of resize
  (no test case, noticed during code review)
* Documented two known side-effects of the threading patch in the
  commit message (bugs fixed due to splitting YUV and A state)
* Threading patch updates tests/ref/fate/vp6a

Passes all "fate-vp6" and "fate-vp8" (shouldn't have changed any code
shared with vp8).  FreeBSD is still not running "fate" entirely.