retroarch-bare: add pipewire support (#422466)

pkgs/by-name/re/retroarch-bare/package.nix

···
   libgbm,
   nixosTests,
   nvidia_cg_toolkit,
+  pipewire,
   pkg-config,
   python3,
   qt5,
···
       libv4l
       libxkbcommon
       libgbm
+      pipewire
       udev
     ];