Fix ghc c++ exceptions

[roberth]

Motivation for this change

Fix C++ exception handling in darwin executables linked by GHC.

-fcompact-unwind should probably be applied to all test suites and executables that interface with C++.
Perhaps, after a decade of __compact_unwind existing, it should become the default, but I don't know if the ecosystem is ready for it, so it's opt-in for now.

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/)
• 22.05 Release Notes (or backporting 21.11 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]

I don't think it necessarily makes sense to fix such a GHC deficiency downstream, especially not before upstream has accepted the patch.

[roberth]

not before upstream has accepted the patch.

It has been accepted in 9.4, backported to 9.2.
9.0 has only seen two commits backported since its latest release 3 months ago, so I'm not getting my hopes up for an upstream backport.

Following this up in #166571