avformat: Constify all muxer/demuxers

This is possible now that the next-API is gone.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: James Almer <jamrial@gmail.com>
pull/362/head
Andreas Rheinhardt 4 years ago committed by James Almer
parent d92f38c179
commit bc70684e74
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