Add game-music-emu, a decoder plugin for mpd (close #5431)

@vcunat: nitpicks and add meta.license.

pkgs/applications/audio/game-music-emu/default.nix

@@ -0,0 +1,21 @@
+{ stdenv, fetchurl, cmake }:
+
+stdenv.mkDerivation rec {
+  version = "0.6.0";
+  name = "game-music-emu-${version}";
+
+  src = fetchurl {
+    url = "https://game-music-emu.googlecode.com/files/${name}.tar.bz2";
+    sha256 = "11s9l938nxbrk7qb2k1ppfgizcz00cakbxgv0gajc6hyqv882vjh";
+  };
+
+  buildInputs = [ cmake ];
+
+  meta = with stdenv.lib; {
+    homepage = https://code.google.com/p/game-music-emu/;
+    description = "A collection of video game music file emulators";
+    license = licenses.lgpl21Plus;
+    platforms = platforms.all;
+    maintainers = [ ];
+  };
+}

pkgs/servers/mpd/default.nix

@@ -19,6 +19,7 @@
 , aacSupport ? true, faad2
 , pulseaudioSupport ? true, pulseaudio
 , jackSupport ? true, jack2
+, gmeSupport ? true, game-music-emu
 , icuSupport ? true, icu
 }:
 
@@ -59,6 +60,7 @@ in stdenv.mkDerivation rec {
     ++ opt zipSupport zziplib
     ++ opt pulseaudioSupport pulseaudio
     ++ opt jackSupport jack2
+    ++ opt gmeSupport game-music-emu
     ++ opt icuSupport icu;
 
   configureFlags =
@@ -85,6 +87,7 @@ in stdenv.mkDerivation rec {
       (mkFlag jackSupport "jack")
       (mkFlag stdenv.isDarwin "osx")
       (mkFlag icuSupport "icu")
+      (mkFlag gmeSupport "gme")
       "--enable-debug"
     ]
     ++ opt stdenv.isLinux

pkgs/top-level/all-packages.nix

@@ -9991,6 +9991,8 @@ let
 
   fuze = callPackage ../applications/networking/instant-messengers/fuze {};
 
+  game-music-emu = callPackage ../applications/audio/game-music-emu { };
+
   gcolor2 = callPackage ../applications/graphics/gcolor2 { };
 
   get_iplayer = callPackage ../applications/misc/get_iplayer {};