libwnck2: drop

libwnck2 is an old version that is unused in nixpkgs, and depends on gtk
2, which is being removed from nixpkgs.

pkgs/development/libraries/libwnck/2.nix

@@ -1,50 +0,0 @@
-{
-  lib,
-  stdenv,
-  fetchurl,
-  pkg-config,
-  gtk2,
-  intltool,
-  libxres,
-  libx11,
-}:
-
-stdenv.mkDerivation rec {
-  pname = "libwnck";
-  version = "2.31.0";
-
-  src = fetchurl {
-    url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
-    sha256 = "17isfjvrzgj5znld2a7zsk9vd39q9wnsysnw5jr8iz410z935xw3";
-  };
-
-  outputs = [
-    "out"
-    "dev"
-    "devdoc"
-  ];
-  outputBin = "dev";
-
-  nativeBuildInputs = [
-    pkg-config
-    intltool
-  ];
-  buildInputs = [
-    gtk2
-    libx11
-    libxres
-  ];
-  # ?another optional: startup-notification
-
-  configureFlags = [ "--disable-introspection" ]; # not needed anywhere AFAIK
-
-  meta = {
-    description = "Library for creating task lists and pagers";
-    homepage = "https://gitlab.gnome.org/GNOME/libwnck";
-    license = lib.licenses.lgpl21;
-    maintainers = with lib.maintainers; [ johnazoidberg ];
-    # ./xutils.h:31:10: fatal error: 'gdk/gdkx.h' file not found
-    # #include <gdk/gdkx.h>
-    broken = stdenv.hostPlatform.isDarwin;
-  };
-}

pkgs/top-level/aliases.nix

@@ -1349,6 +1349,7 @@ mapAliases {
   libva1-minimal = throw "'libva1-minimal' has been removed, as it is no longer required. Please use libva-minimal."; # Added 2026-05-14
   libviper = throw "'libviper' was removed as it is broken and not maintained upstream"; # Added 2025-05-17
   libWindowsWM = libwindowswm; # Added 2026-01-19
+  libwnck2 = throw "'libwnck2' has been removed as it depended on the deprecated GTK 2 engine."; # Added 2026-08-11
   libwnck3 = throw "'libwnck3' has been renamed to/replaced by 'libwnck'"; # Converted to throw 2025-10-27
   libX11 = libx11; # Added 2026-02-06
   libXau = libxau; # Added 2026-02-06

pkgs/top-level/all-packages.nix

@@ -6106,7 +6106,6 @@ with pkgs;
   libva-utils = callPackage ../development/libraries/libva/utils.nix { };
 
   libwnck = callPackage ../development/libraries/libwnck { };
-  libwnck2 = callPackage ../development/libraries/libwnck/2.nix { };
 
   libwpd = callPackage ../development/libraries/libwpd { };