Haskell broken packages

[c0c0n3]

These two packages are marked as broken in the Nixpkgs (21.11) Haskell set (GHC 8.10.7) we're using in Nixie at the moment:

• haddock-api-2.25.0
• diagrams-graphviz-1.4.1.1

So when you try building Nixie's Haskell env, Nix moans about them being "marked as broken" and fails the build.

Diagrams-Graphviz I pull in myself, so I commented that out in the Haskell env. But Haddock API is a dep of Haddock, so I had to comment out Haddock in the Haskell env to make the env derivation build. Notice that these guys have a history of being broken

• https://github.com/c0c0n3/trixie-dotses/issues/20
• https://github.com/c0c0n3/trixie-dotses/commit/c3453ba976f44e6da7c90a06a1922b13074a4f86
• https://github.com/c0c0n3/trixie-dotses/commit/9a2d603d99b63bca6dfdf3295778fde4378ab451

Also keep in mind there's even more broken packages in the GHC 9.2.1 set. To see that, swap out

pkgs.haskellPackages.ghcWithPackages

for

pkgs.haskell.packages.ghc921.ghcWithPackages

in the mkEnv function.

Come up with a solution!