Using lzip instead of xz for distributed tarballs

[Vanessa McHale]

Hello all,


GHC is distributed as .tar.xz tarballs; I assume this is because it
produces small tarballs. However, xz is ill-suited for archiving due to
its lack of error recovery. Moreover, lzip produces smaller tarballs
with GHC (I tested with ghc-8.8.2-x86_64-deb9-linux.tar) and
decompression takes about the same amount of time.

There's more information on the project page:
https://www.nongnu.org/lzip/lzip.html.

Cheers,
Vanessa McHale

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