[Cin] FFmpeg 5.1 latest version included in August release

[Phyllis Smith]

> The tarball of ffmpeg4 with related patches are still present in
> .../thirdparty/src/. They should be useless now and so can be removed
> (Andrew had requested this).
>
I did remove everything else that Andrew requested as long as it was over 1
month since the updated version.  The reason I did not delete FFmpeg 4.4
source/patches yet is out of an abundance of caution.  In the past when
"package" releases were done, many users automatically got the updates so
it was fairly clear right away when something was affected/broken by the
new release.  However, with AppImages probably 90%+ users no longer upgrade
unless they become aware that there is a fix or improvement that makes it
worth their time.  So I am more concerned about the possibility that it
takes a lot longer to determine if the new updated library has some problem.

And also fixed the ffmpeg.git.patches to reflect 5.1 (which hopefully will
work for all of 5.x upcoming versions).
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