Bug#673538: libobjc3 -> libobjc4 transition
I just read that there might not be time to do the transition, but
this bug actually combined two transitions: the libobjc transition and
the gnustep transition. If the gnustep transition isn't going to
happen, we still need to finish libobjc4 transition on the archs that
have gcc 4.7 as default, right? Because at the moment there is a mix
of packages depending on libobjc3 and libobjc4, which in the case of
for example SOGo means that both libobjc3 and libobjc4 get pulled in.