`colobot` 0.2.0 stopped building with GCC 13, as GCC stopped
transitively including standard header files like `cstdint` in
various scenarios. Luckily, these issues were already solved
upstream, and simply upgrading colobot to v. 0.2.1-alpha fixes
the Nixpkgs build on current GCC versions.
Initial integration without the game musics to reduce the size of the
game. It works without them
Data are in another derivation to let them live their live independently
as they are quite big.
Limited to linux platform only because physfs is currently broken on
darwin.
