VLCKit: make sure that the right archs exist
VLCKit: make sure that the right archs exist

When preparing the framework, guarantee that the expected
architectures are present. If they are not present, or if an
unexpected architecture is present, then reconstruct the universal
binary.

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

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