ppsspp: add upstream patch for FFmpeg 6

[emilazy]

Description of changes

The bundled FFmpeg is used by default anyway, but this fixes compilation with FFmpeg 6 when opting in.

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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[SuperSandro2000]

Why do we even have an option to use the bundled ffmpeg? This seems to go against the distro idea

[emilazy]

Because upstream have their own hacked up FFmpeg and the emulator is often broken with the system one and they don’t support it and are trying to rip out the FFmpeg code entirely in favour of their own stuff. That seems like a distinct discussion from whether to get it off FFmpeg 4.

If you want to get rid of vendored FFmpegs, I’d suggest starting with Chromium (I did some work there for Qt WebEngine that would be useful).