tree-test: Don't return restricted exit codes

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
base64-test: Remove posibility of returning restricted exit codes

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
dct-test: Remove possibility of returning a restricted exit code

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
fft-test: Remove possibility of returning restricted exit code

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
libavutil: x86: Add AVX2 capable CPU detection.

Patch based on x264's AVX2 detection

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
lavc: Edge emulation with dst/src linesize

Allow supporting files for which the image stride is smaller than
the maximum block size + number of subpel mc taps, e.g. a 64x64 VP9
file or a 16x16 VP8 file with -fflags +emu_edge.
lavc: add a VP9 decoder

Originally written by Ronald S. Bultje <rsbultje@gmail.com> with the
help of Clément Bœsch <ubitux@gmail.com>.

Further contributions by:
Anton Khirnov <anton@khirnov.net>
Luca Barbato <lu_zero@gentoo.org>

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Signed-off-by: Anton Khirnov <anton@khirnov.net>