gtkextra: drop

Unused, and has not built [since 2025-01-15](https://hydra.nixos.org/build/282898738).

pkgs/by-name/gt/gtkextra/package.nix

@@ -1,55 +0,0 @@
-{
-  stdenv,
-  lib,
-  fetchurl,
-  pkg-config,
-  gobject-introspection,
-  file,
-  gtk2,
-  glib,
-  cairo,
-  atk,
-  pango,
-  libtiff,
-  libpng,
-  libjpeg,
-}:
-
-stdenv.mkDerivation rec {
-  pname = "gtkextra";
-  version = "3.3.4";
-
-  src = fetchurl {
-    url = "mirror://sourceforge/project/gtkextra/${lib.versions.majorMinor version}/${pname}-${version}.tar.gz";
-    sha256 = "1mpihbyzhv3ymfim93l9xnxmzhwyqdba5xb4rdn5vggdg25766v5";
-  };
-
-  postPatch = ''
-    substituteInPlace configure \
-      --replace "/usr/bin/file" "${file}/bin/file"
-  '';
-
-  nativeBuildInputs = [
-    gobject-introspection
-    pkg-config
-  ];
-
-  buildInputs = [
-    gtk2
-    glib
-    cairo
-    atk
-    pango
-    libtiff
-    libpng
-    libjpeg
-  ];
-
-  meta = with lib; {
-    homepage = "https://gtkextra.sourceforge.net/";
-    description = "GtkExtra is a useful set of widgets for creating GUI's for GTK+";
-    license = licenses.lgpl2Plus;
-    platforms = platforms.linux;
-    maintainers = with maintainers; [ tesq0 ];
-  };
-}

pkgs/top-level/aliases.nix

@@ -868,6 +868,7 @@ mapAliases {
   gtk-engine-bluecurve = "'gtk-engine-bluecurve' has been removed as it has been archived upstream."; # Added 2024-12-04
   gtk2fontsel = throw "'gtk2fontsel' has been removed due to lack of maintenance upstream. GTK now has a built-in font chooser so it's no longer needed for newer apps"; # Added 2024-10-19
   gtkcord4 = dissent; # Added 2024-03-10
+  gtkextra = throw "'gtkextra' has been removed due to lack of maintenance upstream."; # Added 2025-06-10
   gtkperf = throw "'gtkperf' has been removed due to lack of maintenance upstream"; # Added 2024-09-14
   guardian-agent = throw "'guardian-agent' has been removed, as it hasn't been maintained upstream in years and accumulated many vulnerabilities"; # Added 2024-06-09
   guile-disarchive = disarchive; # Added 2023-10-27