[Cython] prange CEP updated

[Dag Sverre Seljebotn]

Moving pull requestion discussion 
(https://github.com/cython/cython/pull/28) over here:

First, I got curious why you'd have a strip off "-pthread" from CC. I'd 
think you could just execute with it with "-pthread", which seems simpler.

Second: If parallel.parallel is not callable, how are scheduling 
parameters for parallel blocks handled? Is there a reason to not support 
that? Do you think it should stay this way, or will parallel take 
parameters in the future?

Dag Sverre