ghc-gc-hook: mark as broken on Darwin

[divanorama]

Description of changes

failure logs
https://hydra.nixos.org/build/197442797/nixlog/1

cbits/hook.c:6:10: error:  fatal error: 'threads.h' file not found
  |
6 | #include <threads.h>
  |          ^
 #include <threads.h>
          ^~~~~~~~~~~
1 error generated.

which seems to be unfixable
https://stackoverflow.com/questions/16244153/clang-c11-threads-h-not-found

ZHF: #199919

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/)
• 22.11 Release Notes (or backporting 22.05 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
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[sternenseemann]

Thanks, I'll update the metadata. Note that your fix is incorrect as you edited an automatically generated file (as is stated at the top), so the change would soon be reverted. Instead you would need to edit the configuration and regenerate the file afterwards, as described in HACKING.md in the same directory.