libsForQt5.k3b: fix build

[ethorsoe]

fix k3b compile with ffmpeg-6 with upstream patches

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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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[K900]

Should we maybe just drop it in favor of the Qt6 version at this point? It feels like a lot of work to keep it alive.

[FliegendeWurst]

Related: #348919

[ethorsoe]

Whatever, just as long as we don't have the most prominent k3b broken and referred by k3b module nixos/modules/programs/k3b.nix.

i think if we do not merge this (or a similar fix) the broken package should be removed so others do not waste time on it.

[FliegendeWurst]

PR to fix nixos/k3b and remove libsForQt5.k3b: #351093

[ethorsoe]

I'll leave this open, until it's decided what is to be done.