[macosx] Ctrl+Space does generate Unknown keychar

Mac OS X 10.7.3, macmini4,1
Print all the key events produced by typing Ctrl+Space on Mac. There will be KEY_TYPED but it is a bad KEY_TYPED since it will have 0 (unknown) keyChar and Ctrl modifier.

On other systems we usually generate KEY_TYPED with Space keychar and Ctrl modifier (which seems a most straightforward thing to do). Apple Java 6, however, doesn't generate KEY_TYPED at all.