python3-setuptools-opt (Install newer setuptools in /opt)

Setuptools is a fully-featured, actively-maintained, and stable
library designed to facilitate packaging Python projects.

Installs to /opt/python$PYVER/site-packages.

Add the following before the python3 build commands in your
Slackbuild to use this version over the stock one in 15.0:

PYVER=$(python3 -c 'import sys; print("%d.%d" % sys.version_info[:2])')
export PYTHONPATH=/opt/python$PYVER/site-packages
