Support split cabinet archives as produced by Windows Update
Support split cabinet archives as produced by Windows Update

I assume they're trying to avoid compressing the firmware, but compressing the
metadata. Not insane, but slightly odd given the metadata is typically tiny.

Fixes: https://github.com/hughsie/fwupd/issues/392

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