cling: fix build on macOS

[thomasjm]

I noticed that the Cling build (and general functionality) was broken on macOS. This is because on macOS, we use libc++ rather than glibc. The latter is self-contained, so it works on Linux without additional includes. But on macOS, we need to add the system includes from the apple-sdk package so it can find files like stdlib.h.

I also inlined some flags and changed the formatting to make it easier to see what's going on. Linux should be unaffected by this change.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• 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/)
• Nixpkgs 25.11 Release Notes (or backporting 24.11 and 25.05 Nixpkgs Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
• NixOS 25.11 Release Notes (or backporting 24.11 and 25.05 NixOS Release notes)
  • (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, pkgs/README.md, maintainers/README.md and other contributing documentation in corresponding paths.

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[afh]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 415831

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aarch64-darwin

✅ 1 package built:

• cling

[veprbl]

Looks reasonable.

[thomasjm]

I see that the formatter check isn't happy with what I've done with the flags, but I'd like to keep it as-is if possible since the readability this way is so much better.

[veprbl]

I would apply the patch. There is not a way to preserve your manual formatting long term, it will eventually be reformatted by someone else.

[thomasjm]

All right, done