ghc: bootstrap 8.2.2 with 8.2.1-binary.

[dhess]

Motivation for this change

8.2.1-binary will be necessary to bootstrap aarch64-linux as 7.10.3-binary is not supported on that platform.

Things done

I have tested this on x86_64-linux by bootstrapping GHC and building a subset of haskellPackages. armv7l-linux and aarch64-linux still cannot bootstrap GHC due to unrelated issues, but as this is a prerequisite and it will cause a rebuild of haskellPackages, it might be a good idea to check it in before the other changes needed to get those platforms working, especially considering it's a straightforward change that shouldn't need any real review.

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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[Ericson2314]

LGTM. But first @peti should push to haskell-updates, right?

[peti]

Test builds are running at https://hydra.nixos.org/jobset/nixpkgs/haskell-updates.

[Ericson2314]

The tests show almost no regressions. The nixpkgs diff since the last one also includes a bunch of unrelated changes (Haskell version bumps, my cross big rebuild, etc), so I'm going to say those few regressions are not this PR's fault. Also I need this PR merged for cross ghc, so I'm going to go ahead and merge it.

@peti hope that is ok.