[Cin] Deleting old libs from thirdparty/src

[Phyllis Smith]

>
> Also, I think we can remove old ffmpeg.git patches, and replace them with
> renamed copies of ffmpeg-5.1 patches .... It will work hopefully until some
> break in ffmpeg :)
>
> I replaced the ffmpeg.git.patches with the updated ffmpeg-5.1 ones and
deleted ffmpeg.git.patch6 and ffmpeg.git.patch6.  Let me know if I made any
mistakes.
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