create a single shared object libscipy_openblas64_.so or libscipy_openblas.so

[mattip]

Related to numpy/numpy#25505

Instead of building a set of shared objects and creating symlinks to them, create only a single shared object. Use a patch to OpenBLAS.

[mattip]

There are some downstream projects using the tarball. here is a github search. This PR changes the shared objects in the tarball, I wonder if it will break their build. I asked on on the jdtuc/fdasrsf_python project.

[rgommers]

They all have copied the numpy/scipy script which pins to an exact hash, so I wouldn't worry about it. This repo is "use at your own risk" anyway.

[mattip]

This works locally, even with the older tarballs. But it requires one change from numpy/numpy#25505: this fix for when scipy-openblas is detected by meson. So in order not to override the current tarball, which is used by numpy builds, I will bump the OpenBLAS version, which is overdue anyway.