added missing export for OverlayManager

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2584 5a81b35b-ba03-0410-adc8-b2c5c5119f08

modules/gui/pymod/CMakeLists.txt

@@ -66,6 +66,7 @@ if (ENABLE_IMG)
   list(APPEND OST_GUI_PYMOD_SOURCES
   export_data_viewer.cc
   export_overlay.cc
+  export_overlay_manager.cc
   )
 endif()