haskell.compiler.ghc*Binary: make sure meta can always be evaluated

[sternenseemann]

The meta set of the binary GHCs is mostly independent of the used bindist (except for pname which includes variantSuffix). Thus we should make sure it can be evaluated even if no bindist is available for the platform, i.e. evaluating outPath may cause an evaluation failure, but meta.platforms not. Use case at present is to make lib.meta.availableOn work everywhere for any GHC (the normal GHCs inherit their platforms list from their respective boot compiler, at least for now).

To fix this we need to make sure that shallowly evaluating passthru doesn't force binDistUsed, since mkDerivation needs to merge passthru into the resulting derivation attribute set, thus forcing the attribute names of passthru. We can easily do this by accessing what we want to learn from ghcBinDists manually and using or to fall back to a sensible default.

Description of changes

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 23.11 Release Notes (or backporting 23.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

[sternenseemann]

Testable using lib.mapAttrs (_: lib.meta.availableOn stdenv.buildPlatform) (lib.filterAttrs (n: _: lib.hasInfix "Binary" n) haskell.compiler)