i263: skip dummy frames

Intel i263 codec has special 8-byte dummy frames that should not be decoded,
so do not even attempt to decode them and skip them instead.

Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
Merge commit 'b2290bf10b12b7772f55fcab014a47e18e9fdef2'

* commit 'b2290bf10b12b7772f55fcab014a47e18e9fdef2':
  i263: skip dummy frames

Merged-by: Michael Niedermayer <michaelni@gmx.at>
configure: Drop duplicate pkg-config entry from help output
Merge commit '852c329a69ddfd635807f60454df07d021c64901'

* commit '852c329a69ddfd635807f60454df07d021c64901':
  configure: Drop duplicate pkg-config entry from help output

Conflicts:
	configure

Merged-by: Michael Niedermayer <michaelni@gmx.at>
x86/blockdsp: restore author attribution

See commits
649c00c96d7044aed46d70623e47d7434318e6b9
5fecfb7d58a12baf326e99f2d071060f2638d93c
73b02e24604961e49a63ca34203d8f6c56612117

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>