Proposal: adding an aarch64 target for termux use

[JJ-IsShort]

I tried using the Linux arm 64 build but it was under aligned:

error: "/data/data/com.termux/files/usr/bin/ffmpeg": executable's TLS segment is underaligned: alignment is 16, needs to be at least 64 for ARM64 Bionic

Adding the possibility for yt-dlp to be used properly on mobile could be helpful. So far, I've only been able to get the video and audio separately. When yt-dlp tried combining them together, an error happened. This was only tested on Rick Astley's Never Gonna Give You Up and some other issues reports on yt-dlp's github make it seem like some videos might work while some might not. Still, a fully supported termux experience could be beneficial.

[nihil-admirari]

Please report this issue upstream: https://github.com/BtbN/FFmpeg-Builds/issues.