init-system-helpers blocks libvirt-bin

["Rubén González" <otakulogan@gmail.com>]

Hello.

I have Wheezy with backports preference (I need backports for my
computer's hardware, and create rules for every package for updates is
very boring) and systemd/systemd-sysv (intel-microcode package produce
problems with sysvinit).
New package init-system-helpers demands remove systemd when I try to
install libvirt-bin for kvm-qemu emulation, because dependency of
init-system-helpers is systemd superior version that in the
main/backports repository.