default-crate-overrides.nix: add gtk-sys (gtk3)

[ghost]

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/)
• 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.

[ghost]

Resolved merge conflict.

[alyssais]

Seems like now gobject-sys is failing before it even gets to the crates here.

(Also, would you mind sticking to at most one commit per crate? The commits are a bit noisy to read through when they go back and redo earlier commits. Thanks!)

[ghost]

(Also, would you mind sticking to at most one commit per crate? The commits are a bit noisy to read through when they go back and redo earlier commits. Thanks!)

Sorry about that. These came about piecemeal when I managed to get gtk4-rs working in crate2nix for nix-garta. I should have just kept pushing more commits onto a single PR.

Seems like now gobject-sys is failing before it even gets to the crates here.

Investigating.

[alyssais]

I should have just kept pushing more commits onto a single PR.

Many PRs is fine — it's just the commit structure I was talking about.

[ghost]

(Also, would you mind sticking to at most one commit per crate? The commits are a bit noisy to read through when they go back and redo earlier commits. Thanks!)

I think this is fallout from an earlier rebase I did wrong. Sorry about that.

Many PRs is fine — it's just the commit structure I was talking about.

I would like to split out default-crate-overrides.nix into separate files, so the default-crate-overrides.nix becomes just (roughly) mapAttrs callPackage (builtins.readDir ./). Sort of like we keep talking about doing to all-packages.nix.