Packaging setuptools from a separate source package allows it to stay
updated with upstream.
Host setuptools will remain installed as part of python3. Host
setuptools is used in a much more controlled way and so is less critical
for it to track upstream.
setuptools was in a separate source package that was removed in
a53d0c5a403d1669e2cf6c59c2be6a9d3ed633a0; this work is not based on that
earlier package.
Signed-off-by: Jeffery To <jeffery.to@gmail.com>
(cherry picked from commit b4975f8bbb)
