Fall back to non-EFI if booted using EFI but -efi is missing

Fall back to non-EFI if booted using EFI but -efi is missing

It may be possible, particularly in recovery situations, to be booted
using EFI on x86 when only the i386-pc target is installed, or on ARM
when only the arm-uboot target is installed.  There's nothing actually
stopping us installing i386-pc or arm-uboot from an EFI environment, and
it's better than returning a confusing error.

Author: Steve McIntyre <93sam@debian.org>
Forwarded: no
Last-Update: 2019-05-24

Patch-Name: install-efi-fallback.patch