Speed up loading ALPM packages
Speed up loading ALPM packages

Only load properties when (and if) they are required.

mitya57/appstream-glib,hughsie/appstream-glib,superm1/appstream-glib,hughsie/appstream-glib,kalev/appstream-glib,ikeydoherty/appstream-glib,ximion/appstream-glib,kalev/appstream-glib,ikeydoherty/appstream-glib,ximion/appstream-glib,ximion/appstream-glib,superm1/appstream-glib,mitya57/appstream-glib,hughsie/appstream-glib