[PATCH] cygport: allow for different package compression types and implement ZStandard decompression

[Achim Gratz]

Achim Gratz writes:
> Now that setup and calm know about Zstandard compression it's about time
> we teach cygport the same.
[…]
> While our packaged tar does not yet know about zst files the compressor
> has to be named explicitly, eventually Eric will get around and release
> a new version hopefully and then this can get automatic.  As
> demonstrated above the facility can be used to do other useful things
> besides changing the compression type and extension.

Since tar has been updated by me in the interim, this patch is no longer
needed just to make use of .tar.zst source archives (I've confirmed that
by building a package with souch a source archive on the CI).


Regards,
Achim.
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