package/python-idna: add host variant

A host variant of the python-idna package will be needed for the
host-python-requests package.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 7c4a52e08789997229f505f59853a095b03c6668)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python-idna/python-idna.mk

@@ -10,5 +10,7 @@ PYTHON_IDNA_SITE = https://files.pythonhosted.org/packages/cb/38/4c4d00ddfa48abe
 PYTHON_IDNA_LICENSE = BSD-3-Clause
 PYTHON_IDNA_LICENSE_FILES = LICENSE.md
 PYTHON_IDNA_SETUP_TYPE = setuptools
+HOST_PYTHON_IDNA_NEEDS_HOST_PYTHON = python3
 
 $(eval $(python-package))
+$(eval $(host-python-package))