gtk: use one clean-immodules-cache setup-hook

Use one hook with substituteAll instead
of duplicating the hook for every version.

pkgs/development/libraries/gtk/2.x.nix

@@ -1,4 +1,4 @@
-{ config, lib, stdenv, fetchurl, pkg-config, gettext, glib, atk, pango, cairo, perl, xorg
+{ config, lib, substituteAll, stdenv, fetchurl, pkg-config, gettext, glib, atk, pango, cairo, perl, xorg
 , gdk-pixbuf, xlibsWrapper, gobject-introspection
 , xineramaSupport ? stdenv.isLinux
 , cupsSupport ? config.gtk2.cups or stdenv.isLinux, cups ? null
@@ -12,6 +12,16 @@ assert cupsSupport -> cups != null;
 
 with lib;
 
+let
+
+  gtkCleanImmodulesCache = substituteAll {
+    src = ./hooks/clean-immodules-cache.sh;
+    gtk_module_path = "gtk-2.0";
+    gtk_binary_version = "2.10.0";
+  };
+
+in
+
 stdenv.mkDerivation rec {
   pname = "gtk+";
   version = "2.24.32";
@@ -27,8 +37,8 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   setupHooks =  [
-    ./hooks/gtk2-clean-immodules-cache.sh
     ./hooks/drop-icon-theme-cache.sh
+    gtkCleanImmodulesCache
   ];
 
   nativeBuildInputs = setupHooks ++ [ perl pkg-config gettext gobject-introspection ];