Bug#968210: statsmodels: arm* test failures/crashes

[Rebecca N. Palmer]

> This doesn't crash when just that test file is run in statsmodels 
> 0.11.1-3 qemu-armel, but this isn't 100% proof that -4 (rather than a 
> dependency) caused it.

-4 (built locally in qemu) doesn't crash that way either, which suggests 
this bug doesn't show up in qemu, and (given the lack of relevant 
changes from -3 to -4) probably is caused by a dependency.