package/python-pyzmq: add cython for python-pyzmq

When migrating to setuptools with pep517 support we need to add
host-python-cython which is a pep517 build dependency for
python-pyzmq.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
1 file changed