trivial: Fix compile with AppStreamGlib git master
trivial: Fix compile with AppStreamGlib git master

superm1/fwupd,hughsie/fwupd,vathpela/fwupd,hughsie/fwupd,fwupd/fwupd,superm1/fwupd,superm1/fwupd,fwupd/fwupd,vathpela/fwupd,vathpela/fwupd,vathpela/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd