swscale: Add support for unscaled 8-bit Packed RGB -> Planar RGB

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
vf_lut: correct color/comp permutation

Fixes Ticket2225

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
dv: Correctly identify CDVC profile

Fixes Ticket2177

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
exr: simplify decompression path

Signed-off-by: Paul B Mahol <onemda@gmail.com>
exr: piz decompression (ugly)

Signed-off-by: Paul B Mahol <onemda@gmail.com>