graphicsmagick137: remove, not referenced anymore

pkgs/applications/graphics/graphicsmagick/1.3.7.nix

···
-{stdenv, fetchurl, bzip2, freetype, graphviz, ghostscript
-, libjpeg, libpng, libtiff, libxml2, zlib, libtool
-, libX11}:
-
-let version = "1.3.7"; in
-
-stdenv.mkDerivation {
-  name = "graphicsmagick-${version}";
-
-  src = fetchurl {
-    url = "mirror://sourceforge/graphicsmagick/GraphicsMagick-${version}.tar.gz";
-    sha256 = "0bwyqqvajz0hi34gfbjvm9f78icxk3fb442mvn8q2rapmvfpfkgf";
-  };
-
-  configureFlags = "--enable-shared";
-
-  buildInputs =
-    [ libpng bzip2 freetype ghostscript graphviz libjpeg libtiff libX11 libxml2
-      zlib libtool
-    ];
-
-  postInstall = ''
-    sed -i 's/-ltiff.*'\'/\'/ $out/bin/*
-  '';
-
-  meta = {
-    homepage = http://www.graphicsmagick.org;
-    description = "Swiss army knife of image processing";
-    license = stdenv.lib.licenses.mit;
-    platforms = stdenv.lib.platforms.all;
-  };
-}

pkgs/top-level/all-packages.nix

···
   graphicsmagick = callPackage ../applications/graphics/graphicsmagick { };
   graphicsmagick_q16 = callPackage ../applications/graphics/graphicsmagick { quantumdepth = 16; };
 
-  graphicsmagick137 = callPackage ../applications/graphics/graphicsmagick/1.3.7.nix {
-    libpng = libpng12;
-  };
-
   gtkpod = callPackage ../applications/audio/gtkpod {
     gnome = gnome3;
     inherit (gnome) libglade;