Barnabás Pőcze authored May 15, 2021 and Wim Taymans committed May 16, 2021

`av_register_all()` is the only thing used from libavformat,
but that doesn't seem to be needed for codec enumeration,
so remove it, and call `avcodec_register_all()` instead
when libavcodec < 58.10.100.