parcellite: add which and xdotool as dependencies

These allows Parcellite's auto-paste feature to work out of the box.

pkgs/tools/misc/parcellite/default.nix

@@ -1,5 +1,6 @@
 { stdenv, fetchFromGitHub, autoreconfHook
-, gtk2, hicolor_icon_theme, intltool, pkgconfig, wrapGAppsHook }:
+, gtk2, hicolor_icon_theme, intltool, pkgconfig
+, which, wrapGAppsHook, xdotool }:
 
 stdenv.mkDerivation rec {
   name = "parcellite-${version}";
@@ -15,6 +16,11 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ autoreconfHook intltool pkgconfig wrapGAppsHook ];
   buildInputs = [ gtk2 hicolor_icon_theme ];
 
+  preFixup = ''
+    # Need which and xdotool on path to fix auto-pasting.
+    gappsWrapperArgs+=(--prefix PATH : "${which}/bin:${xdotool}/bin")
+  '';
+
   meta = with stdenv.lib; {
     description = "Lightweight GTK+ clipboard manager";
     homepage = https://github.com/rickyrockrat/parcellite;