Issue with complex scalar support for block vectors in version 3.7.0

When use PETSc is built with support for complex scalars, slepc4py fails to build with error:

error: cannot convert ‘PetscScalar {aka std::complex<double>}’ to ‘double’ for argument ‘1’ to ‘PyObject* PyFloat_FromDouble(double)’

This originates from line 498 of BV.pyx which reads: v.setArray([mval[i] for i in range(0, k - l)])

As a work around I am just commenting out this line as I am not using block vectors currently.

Cython==0.24 g++ 5.3.1

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