Comment 1 for bug 1717767

Similar failure occurred previously:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=758022

See also upstream issue:
https://github.com/scipy/scipy/issues/5363
In particular, pv's comment:

> Much of scipy.special regards 1e-12 relative accuracy
> to be sufficient, so I don't see particular problems
> in bumping the tolerances here."