treewide: Add passthru.updateScript to gnome pkgs

`updateScript` lets us update packages automatically.
For packages that are hosted on the gnome mirror it's very easy to add
that. Inspired by https://github.com/NixOS/nixpkgs/issues/36150

pkgs/development/libraries/hyena/default.nix

@@ -1,11 +1,11 @@
 { stdenv, fetchurl, pkgconfig, mono, gtk-sharp-2_0, monoDLLFixer }:
 
 stdenv.mkDerivation rec {
-  name = "hyena-${version}";
+  pname = "hyena";
   version = "0.5";
 
   src = fetchurl {
-    url = "mirror://gnome/sources/hyena/${version}/hyena-${version}.tar.bz2" ;
+    url = "mirror://gnome/sources/${pname}/${stdenv.lib.versions.majorMinor version}/${pname}-${version}.tar.bz2";
     sha256 = "eb7154a42b6529bb9746c39272719f3168d6363ed4bad305a916ed7d90bc8de9";
   };