Simplify `setup.py` now that there's no logic and no static info.
Simplify `setup.py` now that there's no logic and no static info.

The `setup()` call is no longer conditional on the platform, since the
platform-dependent modules are "extras" that depend on separate libraries.

And since most of the static settings are now in the `setup.cfg` file, all
of that is not required even.

rosjat/python-scsi