Try to use pkgconf-pypi for blas dependency

[arcondello]

Try to use https://github.com/pypackaging-native/pkgconf-pypi for scipy-openblas configuration

AI Generation Disclosure

No AI used.

[arcondello]

Hmm, unfortunately the pkgconf doesn't play nicely with the lack of universal wheel for scipy-openblas. This means that our x86-64 MacOS build fails.

Some options off the top of my head:

• Drop the scipy-openblas build for MacOS x86-64. Honestly how many of those users do we still have?
• Just drop this PR entirely and keep the status quo.
• I think we could swap the order of the delocate-merge depending on whether we're trying to do an arm or x86-64 build. But yeah, that seems like a mess.
• Rather than merging the wheels, we might be able to install them into individual environments, dump the pkgconf files somewhere, and then append the pkgconf path.