Bug#808634: cadabra in Debian

[Kasper Peeters <kasper.peeters@phi-sci.com>]

> Uploaded last night. The build failed on a bunch of architectures
> (arm64, armel, armhf, pppc64el, powerpc, s390x)) due to failing tests.
> It was always the test fieldtheory which hang on these architectures
> and was killed after reaching an timeout.
> 
> My current suspicion is that lie doesn't behave as expected on these
> architectures. Haven't checked it explicitly, though.

I would not waste more time on this; the bit that requires LiE is only
a very small part of the total functionality, and this dependency will
go away in 2.x anyway. Just disabling that test is fine with me.

Cheers,
Kasper