package/python-certifi: add host variant

matplotlib 3.4.3 depends on host-python-certifi

Signed-off-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/python-certifi/python-certifi.mk

@@ -12,3 +12,4 @@ PYTHON_CERTIFI_LICENSE = ISC (Python code), MPL-2.0 (cacert.pem)
 PYTHON_CERTIFI_LICENSE_FILES = LICENSE
 
 $(eval $(python-package))
+$(eval $(host-python-package))