ringracers: Prefer upstream nixpkgs version

This is now possible since ringracers is in nixos-unstable.

packages/ringracers.nix

@@ -1,95 +0,0 @@
-{ lib
-, stdenv
-, fetchzip
-, fetchFromGitHub
-, cmake
-, curl
-, nasm
-, game-music-emu
-, libpng
-, SDL2
-, SDL2_mixer
-, libvpx
-, libyuv
-, zlib
-, makeWrapper
-, makeDesktopItem
-, copyDesktopItems
-}:
-
-stdenv.mkDerivation (finalAttrs: {
-  pname = "ringracers";
-  version = "2.3";
-
-  src = fetchFromGitHub {
-    owner = "KartKrewDev";
-    repo = "RingRacers";
-    rev = "v${finalAttrs.version}";
-    hash = "sha256-X2rSwZOEHtnSJBpu+Xf2vkxGUAZSNSXi6GCuGlM6jhY=";
-  };
-
-  assets = fetchzip {
-    name = "${finalAttrs.pname}-${finalAttrs.version}-assets";
-    url = "https://github.com/KartKrewDev/RingRacers/releases/download/v${finalAttrs.version}/Dr.Robotnik.s-Ring-Racers-v${finalAttrs.version}-Assets.zip";
-    hash = "sha256-sHeI1E6uNF0gBNd1e1AU/JT9wyZdkCQgYLiMPZqXAVc=";
-    stripRoot = false;
-  };
-
-  nativeBuildInputs = [
-    cmake
-    nasm
-    makeWrapper
-    copyDesktopItems
-  ];
-
-  buildInputs = [
-    curl
-    game-music-emu
-    libpng
-    SDL2
-    SDL2_mixer
-    libvpx
-    libyuv
-    zlib
-  ];
-
-  cmakeFlags = [
-    "-DSRB2_ASSET_DIRECTORY=${finalAttrs.assets}"
-    "-DGME_INCLUDE_DIR=${game-music-emu}/include"
-    "-DSDL2_MIXER_INCLUDE_DIR=${lib.getDev SDL2_mixer}/include/SDL2"
-    "-DSDL2_INCLUDE_DIR=${lib.getDev SDL2}/include/SDL2"
-  ];
-
-  desktopItems = [
-    (makeDesktopItem rec {
-      name = "Ring Racers";
-      exec = "ringracers";
-      icon = "ringracers";
-      comment = "Kart racing mod based on SRB2";
-      desktopName = name;
-      startupWMClass = ".ringracers-wrapped";
-      categories = [ "Game" ];
-    })
-  ];
-
-  installPhase = ''
-    runHook preInstall
-
-    install -Dm644 ../srb2.png $out/share/icons/hicolor/256x256/apps/ringracers.png
-    install -Dm755 bin/ringracers $out/bin/ringracers
-
-    wrapProgram $out/bin/ringracers \
-      --set RINGRACERSWADDIR "${finalAttrs.assets}"
-
-    runHook postInstall
-  '';
-
-  meta = with lib; {
-    description = "Kart racing video game based on Sonic Robo Blast 2 (SRB2), itself based on a modified version of Doom Legacy";
-    homepage = "https://kartkrew.org";
-    platforms = platforms.linux;
-    license = licenses.gpl2Plus;
-    maintainers = with maintainers; [ donovanglover ];
-    mainProgram = "ringracers";
-  };
-})