VLCEventManager: synchronize creation of shared object
VLCEventManager: synchronize creation of shared object

Signed-off-by: Jean-Baptiste Kempf <7b85a41a628204b76aba4326273a3ccc74bd009a@videolan.org>

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