remove unused (hackage) tarball handling code for StackageSdistR

[juhp]

I noticed this code seems unused since
http://hackage.fpcomplete.com/package/ seems 404

So afaict this can be removed safely. Does anyone see a problem?

[juhp]

This is just a cleanup PR so it is not urgent.

[chreekat]

Actually I think it does still work. The link you gave in the PR description is a 404, but the individual package URLs are not.

E.g. https://www.stackage.org/lts-23.7/package/safe-0.3.21.tar.gz

[juhp]

Ah I see what you are saying: http://hackage.fpcomplete.com/package/safe-0.3.21.tar.gz does indeed work.

Though I am not sure, do we actually use it? Let me also try to check more later - this could be a bad idea.

[chreekat]

It might be used by cabal-install if people use the Hackage mirror?

[chreekat]

I don't see any .tar.gz URLs in the logs of the last two days, but I still think it might be a bad idea to remove a functional URL. It might break somebody, somewhere.