Python-warning during build

[tallpsmith]

        ********************************************************************************
        Please avoid running ``setup.py`` directly.
        Instead, use pypa/build, pypa/installer or other
        standards-based tools.

        See https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html for details.
        ********************************************************************************

[tallpsmith]

Not yet sure if this is macOS-specific, or shows up on all distress.