[Cython] enabling refnanny in module init function

[Stefan Behnel]

Hi,

Lisandro Dalcin wrote:
> Try the trivial patch below, the problems with globals get fixed...
> However, enabling the refnanny will spot other reference count
> problems, at least I get them in mpi4py ....

Yes, I've looked into some of them and they really need fixing. I've pushed
your patch.

Stefan