portability issues

[Clint Adams]

> 4 - t.systest failed on arm.  details unknown. awaiting more info.

europa is, it seems, under the control of ARMLinux UK, and not a Debian
machine.  They don't want to give me access, and claim that it was
probably a random fluke, since the hardware is identical to the machines
to which I have access.

I will wait until it happens again before pressing the issue further.