d/control-in: fix deps to not pull random qemu-system-$arch (LP: #2127053)

Christian Ehrhardtrequested to merge
paelzer-guest/qemu:lp-2127053-avoid-pulling-random-arch-qemu-system-DEBIAN into master

The current dependencies pull in a random (alphabetical, order depends on apt version) qemu-system-$arch when installing e.g. qemu-system-gui.

We can not just drop the dependencies, as then it would allow incompatible modules to be installed. This approach uses versioned breaks instead of dependencies which retains what we need but fixes what is wrong.

This is the interim state of the discussion we had at https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/2127053 which waited for my experiments to complete. Now that we have that @mjt , please let me know what you think.

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