012v decoder.

The decoder also supports a12v, but removes the transparency layer
since no samples with actual transparency are available for testing.
Support decoding AC-3 in wav.

All known samples are actually ac3-in-spdif-in-wav, so use
the spdif demuxer to get the ac3 frames.
lavfi/kerndeint: fix temp buffer linesize.

Also re-enable the FATE test.
lavfi/kerndeint: remove unused pixel_step.
tests/fate/avfilter.mak: merge pp tests into GPL test list

The mp=pp filter was removed and replaced with a native implementation,
so the dependency on CONFIG_MP_FILTER stands no more.
ff_get_audio_frame_size: try to fix wma in wav

Fixes Ticket1905, Ticket2114

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>