Added optional Ouya compiler flag.
Added optional Ouya compiler flag.

As OpenFL only has an android flag, I added a ouya flag when compiling to ouya. 
This flag is for Input, to have the correct game pad when using Input.joystick()
HaxePunk/HaxePunk,MattTuttle/HaxePunk,bendmorris/haxepop,wselken/HaxePunk,scriptorum/HaxePunk,Pinpickle/Punkiversal,scriptorum/HaxePunk,bendmorris/HaxePunk