VLCEventManager: simplify threading code (closes #8565)
VLCEventManager: simplify threading code (closes #8565)

CollabraMusic/VLCKit,siuying/VLCKit,hpsoar/VLCKit,larrytin/VLCKit,simon1984/test,simon1984/test,larrytin/VLCKit,kamcord/VLCKit,brion/VLCKit,strukturag/VLCKit,kamcord/VLCKit,waterskier2007/VLCKit,i386/vlckit,waterskier2007/VLCKit,CollabraMusic/VLCKit,siuying/VLCKit,siuying/VLCKit,CollabraMusic/VLCKit,strukturag/VLCKit,kamcord/VLCKit,programming086/VLCKit,simon1984/test,programming086/VLCKit,hpsoar/VLCKit,waterskier2007/VLCKit