Build errors for Android not seen in win/osx/iOS

[leehu]

I’ve #defined all the filechooser stuff out for now, but still have:

…/…/…/…/…/…/…/…/…/…/…/JUCE/modules\juce_gui_basics/native/juce_android_Windowing.cpp:40: error: undefined reference to ‘juce_CreateApplication()’