lavfi: remove remaining forgotten min/rej perms.
vp3: embed idct_permutation array directly in VP3DecoderContext.

This makes the vp3 decoder less dependent on dsputil, and will aid
in making it (eventually) dsputil-independent.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
sink_buffer: remove unused variables

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