[tlbuild] zstd as package compressor

[Norbert Preining]

> If there were a thing where users REALLY could save time, I'd rather
> discuss asynchronous downloads: Instead of just iterating the tlmgr

That would indeed be nice, but I don't see a way we can reasonably
implement this. Unless someone steps forward and reimplements the who
bunch (like I did 15 years ago).

Best

Norbert

--
PREINING Norbert                              https://www.preining.info
Accelia Inc. + IFMGA ProGuide + TU Wien + JAIST + TeX Live + Debian Dev
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