cpanminus: mark as broken

cpanminus is currently responsible for about half of the autobuilder
failures, due to the missing dependency on host-qemu. However, even
with the host-qemu proposed by Arnout, cpanminus will still not work
properly: it will try to execute on the build machine executables
built for the target. While qemu is here to emulate the instruction
set, there is still the unsolved problem of kernel headers version
mismatch between the target and the build environments.

So the whole approach that consists in using host-qemu for building
simply cannot work properly, and until it is solved, the package
should be marked as broken.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>