silence warning about duplicate header

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2423 5a81b35b-ba03-0410-adc8-b2c5c5119f08

modules/gui/src/CMakeLists.txt

@@ -387,7 +387,6 @@ python_shell/state_machine.hh
 python_shell/state.hh
 python_shell/transition.hh
 python_shell/transition_guard.hh
-python_shell/output_redirector.hh
 panels/button_bar.hh
 panels/drop_box.hh
 panels/panel_bar.hh