package/python-dnspython: enable host build

Needed for Samba 4.14.x:
https://gitlab.com/samba-team/samba/-/commit/2420b7c6d2038aca33759ca3a7d41240c5f19bf7#bc16f0673dfbb473658dfd16961cdbf12f02ea5a_8_15

Fixes:
http://autobuild.buildroot.net/results/7dc/7dc7e304cb4e9afb157326dd5e4ae38711e91cad/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python-dnspython/python-dnspython.mk

@@ -17,4 +17,11 @@ define PYTHON_DNSPYTHON_EXTRACT_CMDS
 	$(RM) -r $(@D)/dnspython-$(PYTHON_DNSPYTHON_VERSION)
 endef
 
+define HOST_PYTHON_DNSPYTHON_EXTRACT_CMDS
+	$(UNZIP) -d $(@D) $(HOST_PYTHON_DNSPYTHON_DL_DIR)/$(HOST_PYTHON_DNSPYTHON_SOURCE)
+	mv $(@D)/dnspython-$(HOST_PYTHON_DNSPYTHON_VERSION)/* $(@D)
+	$(RM) -r $(@D)/dnspython-$(HOST_PYTHON_DNSPYTHON_VERSION)
+endef
+
 $(eval $(python-package))
+$(eval $(host-python-package))