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.

(From OE-Core rev: bed18d5df7915e4127a538be9c7550e185c8c850)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/distutils.bbclass

@@ -38,7 +38,7 @@ distutils_do_install() {
         STAGING_LIBDIR=${STAGING_LIBDIR} \
         PYTHONPATH=${D}/${PYTHON_SITEPACKAGES_DIR} \
         BUILD_SYS=${BUILD_SYS} HOST_SYS=${HOST_SYS} \
-        ${STAGING_BINDIR_NATIVE}/python-native/python setup.py install --install-lib=${D}${libdir}/${PYTHON_DIR} ${DISTUTILS_INSTALL_ARGS} || \
+        ${STAGING_BINDIR_NATIVE}/python-native/python setup.py install --install-lib=${D}/${PYTHON_SITEPACKAGES_DIR} ${DISTUTILS_INSTALL_ARGS} || \
         bbfatal "python setup.py install execution failed."
 
         for i in `find ${D} -name "*.py"` ; do \