ADDON_INCLUDES_EXCLUDE in addon_config.mk are still included in project navigator #60

in ofxStreamer i have some header files that need to be excluded from the project navigator in xcode (because its c and not c++ header files). Adding those folders to ADDON_INCLUDES_EXCLUDE removes the files from the build settings, but not from the project navigator.

To reproduce: Clone ofxStreamer -> create a new project with the addon added -> the folders in addons/ofxStreamer/libs/libx264/include should not be there.