Recent setuptools versions require bootstrap.py to be invoked
before the standard setup process. So create such pre configure
hooks for both host and target versions.
Change download location to GitHub because setuptools doesn't
provide *.tar.gz any longer.
Fix legal info. setuptools is now licensed under MIT licence.
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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