libpng: Multilib update conflict

[Kevin Kofler]

Till Maas wrote:
> there is a -1 karma comment claiming that libpng is broken, because the
> new x86_64 package conflicts with the old i686 package:

That's one of those many invalid -1 comments (and yet another reason why 
karma is broken). You cannot mix different builds of the same package for 
different multilib arches, it will always result in such file conflicts. 
This is completely normal and you are not expected to fix this. The user 
should be upgrading both arches of the package at the same time (or removing 
the 32-bit multilib if it's not needed).

        Kevin Kofler