python-mistune: add host variant

Host variant is required by host-python-m2r.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/python-mistune/python-mistune.mk

@@ -12,3 +12,4 @@ PYTHON_MISTUNE_LICENSE_FILES = LICENSE
 PYTHON_MISTUNE_SETUP_TYPE = setuptools
 
 $(eval $(python-package))
+$(eval $(host-python-package))