Remove a bunch of unreferenced files

Plus a small number of obsolete packages (like old versions of qemu).

pkgs/games/exult/snapshot.nix

@@ -1,44 +0,0 @@
-{ stdenv, fetchurl, SDL, SDL_mixer, zlib, libpng, unzip
-, autoconf, automake, libtool, bison, flex
-}:
-
-stdenv.mkDerivation {
-  name = "exult-1.4-pre-svn-20080712-0500";
-  
-  builder = ./builder.sh;
-  
-  src = fetchurl {
-    url = http://www.math.leidenuniv.nl/~wpalenst/cvs/exult-20080712-0500.tar.gz;
-    sha256 = "186z8qb713yr1wfasfbpgz2wfqwmbh2d6lmgz1v8lhmwmfpkzgc4";
-  };
-
-  buildInputs = [
-    SDL SDL_mixer zlib libpng unzip
-    # The following are only needed because we're building from SVN.
-    autoconf automake libtool bison flex
-  ];
-  
-  NIX_CFLAGS_COMPILE = "-I${SDL_mixer}/include/SDL";
-
-  preConfigure = ''
-    ./autogen.sh
-  '';
-  
-  # Digital recordings of the music on an original Roland MT-32.  So
-  # we don't need actual MIDI playback capability.
-  musicFiles = [
-    (fetchurl {
-      url = mirror://sourceforge/exult/U7MusicOGG_1of2.zip;
-      md5 = "7746d1a9164fd67509107797496553bf";
-    })
-    (fetchurl {
-      url = mirror://sourceforge/exult/U7MusicOGG_2of2.zip;
-      md5 = "cdae5956d7c52f35e90317913a660123";
-    })
-  ];
-
-  meta = {
-    homepage = http://exult.sourceforge.net/;
-    description = "A reimplementation of the Ultima VII game engine (pre-release)";
-  };
-}