[ Andreas Cadhalpun ] * Import new upstream bugfix release 2.8.1. * Remove hls-only-seek-if-there-is-an-offset.patch included upstream. * Add avcodec-vp8-Do-not-use-num_coeff_partitions-in-thread.patch to fix CVE-2015-6761. * Enable x264 on mips64el and opencv on alpha.