gst_all_1.gst-plugins-good: fix build for musl

[alyssais]

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/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 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.

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[jtojnar]

Thanks. Hopefully, this will still apply with #390268

[jtojnar]

Surprised this is enough without extraPrefix = ""; to add a/ and b/ prefixes.

[alyssais]

It's because it leaves the "gst-plugins-good/" prefix, which functions the same as a/ and b/ would.

[alyssais]

Thanks. Hopefully, this will still apply with #390268

Pretty sure it will. I just missed out on getting it into 1.26.0. (My other musl fix submitted just before did make it — that was a fix for a regression introduced after 1.24 so we don't need to worry about it.)