storage: ignore the wrong fstype in /etc/fstab about the EFI Boot Partition

EFI Boot Partitions have partition type EFh (efi) but in Linux we
need to set it to vfat, which is what is effectively inside it.
So, we should just handle the case and consider fstab valid anyways.
sabayon: g_type_init has been deprecated in glib-2.35+
Merge remote-tracking branch 'upstream/master'