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>

package/python-pyzmq/python-pyzmq.mk

@@ -13,6 +13,7 @@ PYTHON_PYZMQ_LICENSE_FILES = LICENSE.LESSER LICENSE.BSD
 PYTHON_PYZMQ_SETUP_TYPE = setuptools
 PYTHON_PYZMQ_BUILD_OPTS = --zmq=$(STAGING_DIR)/usr
 PYTHON_PYZMQ_DEPENDENCIES = \
+	host-python-cython \
 	host-python-packaging \
 	host-python-setuptools-scm \
 	zeromq