Adding support for py-package w/ setup.cfg but w/o setup.py

Hi,

I recently create a new PyPI tool for FreeBSD.
Based on PyPI's instruction, I have setup.cfg only without setup.py.
https://packaging.python.org/en/latest/tutorials/packaging-projects/ suggests go with setup.cfg only for simplicity.

I'm now trying to make a port for it.
However, FreeBSD ports expects a setup.py file.

It looks if we can run "from setuptools import setup; setup()" in Mk/Uses/python.mk if PYSETUP file doesn't exit.

I'm wondering if some FreeBSD python port expert can consider no PYSETUP file configuration.

Hiro