Comment 4 for bug 1521407

Per discussion between jdandrea and clarkb on #openstack-oslo:

http://eavesdrop.openstack.org/irclogs/%23openstack-oslo/%23openstack-oslo.2017-09-06.log.html

It now appears ok to remove the Windows conditions that skip executing override_get_script_args() and install_wrapper_scripts(). Having demonstrated that bdist_wheel works, it should now work for sdist too, and experiments do indeed appear to bear that out.