secp256k1-haskell: unbreak via override

[jtobin]

This library simply needs libsecp256k1 in its pkgconfig-depends.

Motivation for this change

Unbreaks the package.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• 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 nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[cdepillabout]

@jtobin Thanks for looking into this.

Can you instead fix this in cabal2nix? That way we can have pkgs.secp256k1 set correctly for all Haskell packages that use it.

[jtobin]

@cdepillabout PR made, see NixOS/cabal2nix#444.

What's the best thing to now do here? Rebase away the changes in configuration-nix.nix?

[jtobin]

Rebase away the changes in configuration-nix.nix?

(And ditto for #82563.)

[cdepillabout]

What's the best thing to now do here? Rebase away the changes in configuration-nix.nix?

How about waiting for a week or so for peti to merge in the change in NixOS/cabal2nix#444 and release a new version of hackage2nix.

When that happens, please rebase this PR and just leave the part that marks the package unbroken. (You could also just combine your two open PRs into one to make it easier to keep track of.)

If the above PR doesn't get merged within a week or so, please feel free to ping me one more time on this PR and I will go ahead and merge it in as-is.

[jtobin]

All good, will do. Cheers.