distutils/steuptools: Fix files layout and unbreak builds
The last two distutils changes progressivly broke the builds. Firstly they
moved things from the site_packages directory to being higher up the tree
which introduced package QA warnings as a side effect. Secondly, it interacts
badly with setuptools which passes in --root=${D} itself.
This patch restores the original directory layout, hence fixing the QA
warnings and also passes extra options to setuptools to deal with the
--root option it passes.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
