SDL2_mixer_2_0: init at 2.0.4

* As required by `lzwolf`.

pkgs/development/libraries/SDL2_mixer/2_0.nix

@@ -0,0 +1,22 @@
+{ fetchurl
+, lzwolf
+, SDL2_mixer
+, timidity
+}:
+
+SDL2_mixer.overrideAttrs(oa: rec {
+  version = "2.0.4";
+
+  src = fetchurl {
+    url = "https://www.libsdl.org/projects/SDL_mixer/release/SDL2_mixer-${version}.tar.gz";
+    sha256 = "0694vsz5bjkcdgfdra6x9fq8vpzrl8m6q96gh58df7065hw5mkxl";
+  };
+
+  # fix default path to timidity.cfg so MIDI files could be played
+  postPatch = ''
+    substituteInPlace timidity/options.h \
+      --replace "/usr/share/timidity" "${timidity}/share/timidity"
+  '';
+
+  passthru.tests.lzwolf = lzwolf;
+})

pkgs/top-level/all-packages.nix

@@ -23186,6 +23186,8 @@ with pkgs;
   SDL2_mixer = callPackage ../development/libraries/SDL2_mixer {
     inherit (darwin.apple_sdk.frameworks) CoreServices AudioUnit AudioToolbox;
   };
+  # SDL2_mixer_2_0 pinned for lzwolf
+  SDL2_mixer_2_0 = callPackage ../development/libraries/SDL2_mixer/2_0.nix { };
 
   SDL2_net = callPackage ../development/libraries/SDL2_net { };