xfce.libxfce4windowing: Move away from mkXfceDerivation

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

pkgs/desktops/xfce/core/libxfce4windowing/default.nix

@@ -1,9 +1,12 @@
 {
   stdenv,
   lib,
-  mkXfceDerivation,
+  fetchFromGitLab,
+  gettext,
+  pkg-config,
   python3,
   wayland-scanner,
+  xfce4-dev-tools,
   glib,
   gtk3,
   libdisplay-info,
@@ -18,18 +21,32 @@
     && stdenv.hostPlatform.emulatorAvailable buildPackages,
   buildPackages,
   gobject-introspection,
+  gitUpdater,
 }:
 
-mkXfceDerivation {
-  category = "xfce";
+stdenv.mkDerivation (finalAttrs: {
   pname = "libxfce4windowing";
   version = "4.20.4";
 
-  sha256 = "sha256-8iLkljuGyJ4giVN5yuOFuTZsrdr8U3avTS/1aRSpaxc=";
+  outputs = [
+    "out"
+    "dev"
+  ];
+
+  src = fetchFromGitLab {
+    domain = "gitlab.xfce.org";
+    owner = "xfce";
+    repo = "libxfce4windowing";
+    tag = "libxfce4windowing-${finalAttrs.version}";
+    hash = "sha256-8iLkljuGyJ4giVN5yuOFuTZsrdr8U3avTS/1aRSpaxc=";
+  };
 
   nativeBuildInputs = [
+    gettext
+    pkg-config
     python3
     wayland-scanner
+    xfce4-dev-tools
   ]
   ++ lib.optionals withIntrospection [
     gobject-introspection
@@ -51,9 +68,19 @@ mkXfceDerivation {
     patchShebangs xdt-gen-visibility
   '';
 
+  configureFlags = [ "--enable-maintainer-mode" ];
+  enableParallelBuilding = true;
+
+  passthru.updateScript = gitUpdater {
+    rev-prefix = "libxfce4windowing-";
+    odd-unstable = true;
+  };
+
   meta = {
     description = "Windowing concept abstraction library for X11 and Wayland";
+    homepage = "https://gitlab.xfce.org/xfce/libxfce4windowing";
     license = lib.licenses.lgpl21Plus;
+    platforms = lib.platforms.linux;
     teams = [ lib.teams.xfce ];
   };
-}
+})