[Cython] fixing refnanny macros to avoid GCC warnings

[Dag Sverre Seljebotn]

Lisandro Dalcin wrote:
> I'm now getting many warnings like below:
> 
> src/petsc4py_PETSc.c: In function '__pyx_f_8petsc4py_5PETSc_asarray':
> src/petsc4py_PETSc.c:3793: warning: value computed is not used
> 

Does this mean that you compile with CYTHON_REFNANNY though?

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Dag Sverre