trivial: Remove the s390 debian build as it's currently broken
trivial: Remove the s390 debian build as it's currently broken

hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd