* 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
This allows you to use the disk cache (you cannot have both enabled at
the same time) locally and we disabled fetching from the cache on
Windows (outside of CI) anyway, so passing --remote_http_cache was a noop.
