package/python-pillow: enable host variant

This commit enables the host variant of the python-pillow package, as
it is needed as a dependency to build some specific versions of
OP-TEE.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/python-pillow/python-pillow.mk

@@ -72,3 +72,4 @@ PYTHON_PILLOW_BUILD_OPTS += --disable-webp --disable-webpmux
 endif
 
 $(eval $(python-package))
+$(eval $(host-python-package))