master build fails in unit test

[Regina Henschel]

Hi Markus,

[..]
>
> That looks a lot more like a broken OpenCL driver. This is surely not
> related to the commit.
>

I mentioned it only, that you know, how "new" my local version is. I had 
a similar fail on 5.5.2016.

Is "a broken OpenCL driver" something that needs actions on my side?

Kind regards
Regina