[Cin] August new release of CinGG appimages with FFmpeg upgrade to 4.4

[Phyllis Smith]

OK, here it is.  Not sure what the rpm files are for and I do not know how
to make those.

https://cinelerra-gg.org/download/src/cinelerra-5.1-20210831.src.tgz

oops, looks like src tarballs stopped appearing here in last year:
>
> https://cinelerra-gg.org/download/src/
>
> can you prepare new source release too (so it can be picked by fossils.org
> webpage) ?
>
>
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