gnustep: move to pkgs/desktops/gnustep

pkgs/desktops/gnustep/make/gsmakeDerivation.nix

@@ -0,0 +1,19 @@
+{ stdenv, lib, make, makeWrapper, which }:
+{ buildInputs ? [], ...} @ args:
+stdenv.mkDerivation (args // {
+  buildInputs = [ makeWrapper make which ] ++ buildInputs;
+
+  builder = ./builder.sh;
+  setupHook = ./setup-hook.sh;
+
+  GNUSTEP_MAKEFILES = "${make}/share/GNUstep/Makefiles";
+
+  meta = {
+    homepage = http://gnustep.org/;
+
+    license = stdenv.lib.licenses.lgpl2Plus;
+
+    maintainers = with stdenv.lib.maintainers; [ ashalkhakov matthewbauer ];
+    platforms = stdenv.lib.platforms.linux;
+  } // (if builtins.hasAttr "meta" args then args.meta else {});
+})