xfce.xfce4-settings: Move away from mkXfceDerivation

To reduce the diff when build system change comes.
mkXfceDerivation is generally pointless with meson.

pkgs/desktops/xfce/core/xfce4-settings/default.nix

@@ -1,7 +1,12 @@
 {
+  stdenv,
   lib,
-  mkXfceDerivation,
+  fetchFromGitLab,
+  gettext,
+  pkg-config,
+  xfce4-dev-tools,
   wayland-scanner,
+  wrapGAppsHook3,
   exo,
   garcon,
   gtk3,
@@ -23,17 +28,27 @@
   xf86inputlibinput,
   colord,
   withColord ? true,
+  gitUpdater,
 }:
 
-mkXfceDerivation {
-  category = "xfce";
+stdenv.mkDerivation (finalAttrs: {
   pname = "xfce4-settings";
   version = "4.20.2";
 
-  sha256 = "sha256-hx1ilXPcwWWDwNR/k2b+9vR5aCv9UlPR0d42OE6JxEk=";
+  src = fetchFromGitLab {
+    domain = "gitlab.xfce.org";
+    owner = "xfce";
+    repo = "xfce4-settings";
+    tag = "xfce4-settings-${finalAttrs.version}";
+    hash = "sha256-hx1ilXPcwWWDwNR/k2b+9vR5aCv9UlPR0d42OE6JxEk=";
+  };
 
   nativeBuildInputs = [
+    gettext
+    pkg-config
+    xfce4-dev-tools
     wayland-scanner
+    wrapGAppsHook3
   ];
 
   buildInputs = [
@@ -56,6 +71,7 @@ mkXfceDerivation {
   ++ lib.optionals withColord [ colord ];
 
   configureFlags = [
+    "--enable-maintainer-mode"
     "--enable-pluggable-dialogs"
     "--enable-sound-settings"
     (lib.enableFeature withXrandr "xrandr")
@@ -63,8 +79,19 @@ mkXfceDerivation {
   ++ lib.optionals withUpower [ "--enable-upower-glib" ]
   ++ lib.optionals withColord [ "--enable-colord" ];
 
+  enableParallelBuilding = true;
+
+  passthru.updateScript = gitUpdater {
+    rev-prefix = "xfce4-settings-";
+    odd-unstable = true;
+  };
+
   meta = {
     description = "Settings manager for Xfce";
+    homepage = "https://gitlab.xfce.org/xfce/xfce4-settings";
+    license = lib.licenses.gpl2Plus;
+    mainProgram = "xfce4-settings-manager";
+    platforms = lib.platforms.linux;
     teams = [ lib.teams.xfce ];
   };
-}
+})