[Cin] Free and NetBSD patches in one series

[Andrew Randrianasulu]

so, I tested them on

Slackware 15.0 i586 (static link w/ ffmpeg 6.1 and dynamic with ffmpeg 4.4)
Termux aarch64 (dynamic so far)
Freebsd 14.0 amd64 updated to latest packages
NetBSD 9.2 i386 updated to latest user packages
Ubuntu 16.04 amd64 - static ffmpeg 6.1 without dav1d

currently testing: Debian 11.0 amd64
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