Previously, only the unwrapped derivation had it. This is problematic to report
issues on Synapse because you cannot read the maintainers from the REPL. :)
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
By just appending site-packages to the extraPackages, you would get situations like
pysaml2 being included in pythonpath, but not its dependencies like pytz and dateutils
