Log Message:
math/py-scipy: correct linking with netlib BLAS

This fixes _superlu.so ending up without liblas linkage, which rendered parts
of scipy defunct. This features subtle interaction with the meson build logic.
Hopefully a new version handles distinct BLAS and CBLAS explictly.

Netlib and openblas variants are the only supported choices right now. It is
open how we'd interface with the custom logic regarding framework.accelerate
or mkl. This is work in progress upstream, and I am trying to influence it
so that a blaswrap package approach based on pkg-config files would work.