{tor,mullvad}-browser: add support for GPU acceleration

[felschr]

Description of changes

Previously Tor/Mullvad Browser didn't have support for GPU acceleration.
On about:support under Compositing it would show WebRender (Software) and there were a lot of occurrences of FEATURE_FAILURE_GLXTEST_FAILED.

I've added neccessary dependencies for GPU acceleration as well as some new dependencies & options to better support Wayland, Pipewire & VA-API.

I also added autoPatchelfHook to fix glxtest, which threw an error before on startup of the browser, which could be seen in the console:

❯ mullvad-browser
[GFX1-]: FireTestProcess failed: Failed to spawn child process “/nix/store/4irsfq4c6jhlvikr6i93gm0bq8q2nlrf-mullvad-browser-13.0.1/share/mullvad-browser/glxtest” (No such file or directory)

Crash Annotation GraphicsCriticalError: |[0][GFX1-]: glxtest: ManageChildProcess failed
 (t=0.246357) [GFX1-]: glxtest: ManageChildProcess failed

Crash Annotation GraphicsCriticalError: |[0][GFX1-]: glxtest: ManageChildProcess failed
 (t=0.246357) |[1][GFX1-]: No GPUs detected via PCI
 (t=0.246385) [GFX1-]: No GPUs detected via PCI

After these changes Compositing in about:support will show up as WebRender & all FEATURE_FAILURE_GLXTEST_FAILED (except for the *.failureid settings) are gone.

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.

[felschr]

Result of nixpkgs-review pr 267085 run on x86_64-linux 1

2 packages built:

• mullvad-browser
• tor-browser

[felschr]

Should've mentioned that my system uses an AMD Radeon RX 6700 XT.
Perhaps someone with an Intel or NVIDIA system could check if this works for them.

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-ready-for-review/1016/77

[github-actions]

Successfully created backport PR for release-23.05:

• [Backport release-23.05] {tor,mullvad}-browser: add support for GPU acceleration #269003