swscale: Use alpha from the right row in yuva2rgba_c

Every other pixel had the alpha channel taken from the wrong
row.

This fixes bug 504.

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
pixdesc: add function to return pixel format with swapped endiannes
swscale: add support for endianness only conversion

Use bitfields in FormatEntry array to avoid wasting an int for each flag.
swscale: support endianness conversion for AV_PIX_FMT_XYZ12
vf_scale: add endianness conversion pixel format in query_formats
fate-jpeg2000-dcinema: force output to xyz12le

Fixes Fate tests on big-endian configs.
jpeg2000dec: cleanup properly after decoding errors

Fixes memory leak in fate-redcode-demux.
jpeg2000dec: initialize static data just once
indeo3: use unaligned reads on reference blocks.

They are not guaranteed to be aligned.
Fixes Bug 503.

CC:libav-stable@libav.org
avconv: remove -deinterlace

It is incompatible with refcounted frames and since it's been deprecated
for a long time now, fixing it is not worth the effort.
configure: make avconv select (a)trim filters

They are now used for -ss/-t
configure: add dependencies to lavfi .pc file

The scale filter depends on sws, resample on lavr, and movie on lavf and
lavc.

Fixes Bug 502.
FATE: use a less ambiguous end time for filter-trim-time test

0.1 seconds at 25 fps is exactly 2.5 frames, which may be rounded either
to 2 or 3 on different platforms.
nut: use meaningful error values

Fix the mispresented EINVAL for EOF on partial files, among the other.
lavc: do not leak frames in avcodec_decode_audio4

Notwithstanding the return value the frame should be freed if
is not going to be used.

Reported-by: Matthew Wolenetz <wolenetz@chromium.org>
oma: return meaningful errors
oma: properly forward errors in oma_read_packet

Prevent spurios EIO on EOF.

CC:libav-stable@libav.org
x86: rnd_template: Eliminate pointless OP_AVG macro indirection
x86: dsputil hpeldsp: Move shared template functions into separate object
x86: dsputil: Move rv40-specific functions where they belong