MVK: propagate debug flag to the underlying libvlc compilation process
MVK: propagate debug flag to the underlying libvlc compilation process

waterskier2007/VLCKit,strukturag/VLCKit,simon1984/test,kamcord/VLCKit,CollabraMusic/VLCKit,strukturag/VLCKit,siuying/VLCKit,hpsoar/VLCKit,kamcord/VLCKit,larrytin/VLCKit,hpsoar/VLCKit,waterskier2007/VLCKit,simon1984/test,siuying/VLCKit,CollabraMusic/VLCKit,simon1984/test,CollabraMusic/VLCKit,programming086/VLCKit,programming086/VLCKit,waterskier2007/VLCKit,larrytin/VLCKit,siuying/VLCKit,kamcord/VLCKit