Update to 2.6.1:

version 2.6.1:
- avformat/mov: Disallow ".." in dref unless use_absolute_path is set
- avfilter/palettegen: make sure at least one frame was sent to the filter
- avformat/mov: Check for string truncation in mov_open_dref()
- ac3_fixed: fix out-of-bound read
- mips/asmdefs: use _ABI64 as defined by gcc
- hevc: delay ff_thread_finish_setup for hwaccel
- avcodec/012v: Check dimensions more completely
- asfenc: fix leaking asf->index_ptr on error
- roqvideoenc: set enc->avctx in roq_encode_init
- avcodec/options_table: remove extradata_size from the AVOptions table
- ffmdec: limit the backward seek to the last resync position
- Add dependencies to configure file for vf_fftfilt
- ffmdec: make sure the time base is valid
- ffmdec: fix infinite loop at EOF
- ffmdec: initialize f_cprv, f_stvi and f_stau
- arm: Suppress tags about used cpu arch and extensions
- mxfdec: Fix the error handling for when strftime fails
- avcodec/opusdec: Fix delayed sample value
- avcodec/opusdec: Clear out pointers per packet
- avcodec/utils: Align YUV411 by as much as the other YUV variants
- lavc/hevcdsp: Fix compilation for arm with --disable-neon.
- vp9: fix segmentation map retention with threading enabled.
- Revert "avutil/opencl: is_compiled flag not being cleared in av_opencl_uninit"

(wiz)