gtk: split hooks so gtk2 can use hicolor hook

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

@@ -25,9 +25,12 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  setupHook = ./setup-hook.sh;
+  setupHooks =  [
+    ./gtk2-clean-immodules-cache.sh
+    ./drop-icon-theme-cache.sh
+  ];
 
-  nativeBuildInputs = [ setupHook perl pkgconfig gettext gobject-introspection ];
+  nativeBuildInputs = [ setupHooks perl pkgconfig gettext gobject-introspection ];
 
   patches = [
     ./2.0-immodules.cache.patch

pkgs/development/libraries/gtk/3.x.nix

@@ -49,7 +49,10 @@ stdenv.mkDerivation rec {
   outputs = [ "out" "dev" ];
   outputBin = "dev";
 
-  setupHook = ./gtk3-setup-hook.sh;
+  setupHooks = [
+    ./gtk3-clean-immodules-cache.sh
+    ./drop-icon-theme-cache.sh
+  ];
 
   src = fetchurl {
     url = "mirror://gnome/sources/gtk+/${stdenv.lib.versions.majorMinor version}/gtk+-${version}.tar.xz";
@@ -108,7 +111,7 @@ stdenv.mkDerivation rec {
     pkgconfig
     python3
     sassc
-    setupHook
+    setupHooks
   ];
 
   buildInputs = [

pkgs/development/libraries/gtk/drop-icon-theme-cache.sh

@@ -1,15 +1,5 @@
 # shellcheck shell=bash
 
-fixupOutputHooks+=(_gtk3CleanComments)
-
-# Clean comments that link to generator of the file
-_gtk3CleanComments() {
-    local f="${prefix:?}/lib/gtk-3.0/3.0.0/immodules.cache"
-    if [ -f "$f" ]; then
-        sed 's|Created by .*bin/gtk-query-|Created by bin/gtk-query-|' -i "$f"
-    fi
-}
-
 # Packages often run gtk-update-icon-cache to include their icons in themes’ icon cache.
 # However, since each package is installed to its own prefix, the files will only collide.
 dropIconThemeCache() {

pkgs/development/libraries/gtk/gtk2-clean-immodules-cache.sh

@@ -1,8 +1,10 @@
+# shellcheck shell=bash
+
 fixupOutputHooks+=(_gtk2CleanComments)
 
 # Clean comments that link to generator of the file
 _gtk2CleanComments() {
-    local f="$prefix/lib/gtk-2.0/2.10.0/immodules.cache"
+    local f="${prefix:?}/lib/gtk-2.0/2.10.0/immodules.cache"
     if [ -f "$f" ]; then
         sed 's|Created by .*bin/gtk-query-|Created by bin/gtk-query-|' -i "$f"
     fi

pkgs/development/libraries/gtk/gtk3-clean-immodules-cache.sh

@@ -0,0 +1,11 @@
+# shellcheck shell=bash
+
+fixupOutputHooks+=(_gtk3CleanComments)
+
+# Clean comments that link to generator of the file
+_gtk3CleanComments() {
+    local f="${prefix:?}/lib/gtk-3.0/3.0.0/immodules.cache"
+    if [ -f "$f" ]; then
+        sed 's|Created by .*bin/gtk-query-|Created by bin/gtk-query-|' -i "$f"
+    fi
+}