There's a small amount of additional metadata required for the Mac boot
images to appear as bootable devices in the startup preferencs, so add
support for generating that.
Signed-off-by: Brian C. Lane <bcl@redhat.com>
This adds the new "mkefiboot" cmd, which creates an efiboot img in the
magical way that EFI requires. There doesn't seem to be a good tool for
this (unlike the existing tools for all the other weirdo boot image
types) so it was necessary to create one.