* Update rules_haskell
- rules_haskell now handles the global package db within Bazel
https://github.com/tweag/rules_haskell/pull/859
- We no longer use the Nix provided c2hs. So, we drop it.
- Rename `ghcWithC2hs` to `ghcStatic` to clarify that that's where the
static linking patches are applied.
- Extend package-db patches to align Nix store paths with the new $out.
This works around a restriction in current rules_haskell, where
the paths in the package config files must have the same prefix as
the path to the package config files themselves.
- Don't exclude haskell libraries from extra-libraries entries.
* Drop redundant unix-compat override
This is a left-over from when the package was patched.
* Windows GHC bindist includes ffi header
* Drop unused language-c Nix override
