status of forked zlibs in rsync and zsync

[Florian Festi]

This problem is not restricted to zsync:

deltarpm has the same problem as it supports the rsync protocol, too.
(https://bugzilla.redhat.com/show_bug.cgi?id=526432 - yes, I just opened it)

I did not do the research but it might be worth checking other programs 
that deal with the rsync protocol. There might be some more cases that 
suffer from the same problem.

Anyway, splitting off the modified zlib in a way that other rsync 
related package can build against it would be the minimal step to get 
back on even remotely sane ground.

Florian