libgnome-games-support: support cross compilation

[uninsane]

Description of changes

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/)
• 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.

[Artturin]

libgnome-games-support-aarch64-unknown-linux-gnu> valac -C --pkg gtk+-3.0 --target-glib ' 2.40.0' --pkg glib-2.0 --pkg gio-2.0 --pkg gee-0.8 --color=always --directory games/libgnome-games-support-1.so.3.0.4.p --basedir ../games --library gnome-games-support-1 --header games/libgnome-games-support.h --vapi ../libgnome-games-support-1.vapi --abi-stability --target-glib=2.44 ../games/config.vapi ../games/gridframe.vala ../games/scores/category.vala ../games/scores/context.vala ../games/scores/dialog.vala ../games/scores/directory-importer.vala ../games/scores/history-file-importer.vala ../games/scores/importer.vala ../games/scores/score.vala
libgnome-games-support-aarch64-unknown-linux-gnu> error: Package `gee-0.8' not found in specified Vala API directories or GObject-Introspection GIR directories

weird that it only fails when cross-compiling

[uninsane]

libgnome-games-support-aarch64-unknown-linux-gnu> valac -C --pkg gtk+-3.0 --target-glib ' 2.40.0' --pkg glib-2.0 --pkg gio-2.0 --pkg gee-0.8 --color=always --directory games/libgnome-games-support-1.so.3.0.4.p --basedir ../games --library gnome-games-support-1 --header games/libgnome-games-support.h --vapi ../libgnome-games-support-1.vapi --abi-stability --target-glib=2.44 ../games/config.vapi ../games/gridframe.vala ../games/scores/category.vala ../games/scores/context.vala ../games/scores/dialog.vala ../games/scores/directory-importer.vala ../games/scores/history-file-importer.vala ../games/scores/importer.vala ../games/scores/score.vala
libgnome-games-support-aarch64-unknown-linux-gnu> error: Package `gee-0.8' not found in specified Vala API directories or GObject-Introspection GIR directories

weird that it only fails when cross-compiling

@Artturin grep nixpkgs for "TODO: the vala setuphook should look for vala filess in targetOffset instead of hostOffset". i never dug into this, but if those comments are true then it might explain this (speculating: native compilation was getting the package via vala, unsupported for cross; this patch causes the package to instead be located via gobject-introspection, which better handles the cross compilation case?).

[Artturin]

@Artturin grep nixpkgs for "TODO: the vala setuphook should look for vala filess in targetOffset instead of hostOffset". i never dug into this, but if those comments are true then it might explain this (speculating: native compilation was getting the package via vala, unsupported for cross; this patch causes the package to instead be located via gobject-introspection, which better handles the cross compilation case?).

I see, blame shows that I added those lines and said I was going to do it in a separate PR #189397 (comment)