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This fixes #2 by tweaking `scripts/head.hackage` in two ways:

1. This changes the script to use
   `cabal new-update head.hackage.ghc.haskell.org`, not
   `cabal new-update head.hackage`, since the former is now the name
   of the `repository`. Since `head.hackage.ghc.haskell.org` is
   referred to in quite a few places in the script, I factored this
   out into its own variable.
2. This changes the `url` to use `http://`, not `https://`, so that
   `http-transport: plain-http` works properly. An alternative would
   be to keep the use of `https://` and use `http-transport: curl`
   instead, but that assumes the existence of a `curl` binary on
   one's machine, making it a less portable solution. In any case,
   the use of `http://` in this script shouldn't pose any security
   issues, since `hackage-security` already introduces a security
   layer independent of CAs.

- v2-update is preferred (i.e. `v2-` prefix)
- but it's actually broken, due still existing `cabal-install` bug in
  non-append repository updates
- Also add explicit link to haskell.gitlab.com

Patch libraries to work with GHC 8.9

See merge request !8

Add sop-core-0.5.0.0 patch

See merge request !7

nix: Rip out brokenPackages

See merge request !6

Test all packages with patches

See merge request !5

This fixes the bindist versioning logic.

Otherwise the ret variable isn't captured in the parent environment.

From streaming commit a59174400842f6446eefd4b83e1951696ecdf4e1

Allow additional arguments to be passed to GHC

See merge request !4