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Fri Jan 14 23:16:18 UTC 2022 - Jan Engelhardt <jengelh@inai.de>

- Based on ffmpeg-4.0.spec, update to 5.0
  * New Vulkan-powered filters for video horizontal/vertical
    flipping.
  * Speex decoder.
  * Various new muxers/demuxers.
  * An AV1 low-overhead bitstream format muxer is added.
  * Swscale slice threading support.
  * New audio and video filters.
- Drop soversion.diff (for now; it may very well be reintroduced,
  depending on how 5.1 is released).