Try to use pkgconf-pypi for blas dependency

[arcondello]

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

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[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.

[arcondello]

Ok current version just doesn't do a BLAS build for macos x86-64.

I gotta say, with the pkgconf-pypi change pypackaging-native/pkgconf-pypi#105, I am inclined to abandon this. At least until/unless meson or meson-python adds native support pypackaging-native/pkgconf-pypi#98 (comment).

Additional discussion in pypackaging-native/pkgconf-pypi#110