[FFmpeg-trac] #5776(avformat:new): Add SOCKS proxy support

[FFmpeg]

#5776: Add SOCKS proxy support
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             Reporter:  yan12125  |                     Type:  enhancement
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 FFmpeg has HTTP proxy support via environment variable ```http_proxy``` or
 CLI option ```-http_proxy```, whilist SOCKS proxy support seems missing.
 (```grep -ir socks``` in ffmpeg.git repo and nothing is found) Is it
 possible to add it?

 Downstream request: https://github.com/rg3/youtube-dl/issues/10304

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Ticket URL: <https://trac.ffmpeg.org/ticket/5776>
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