Drop backported patches and rebase the ones that are still relevant.
From version 37 to 38, there is a new build system in place, which is
still custom Makefiles.
This introduces a host-efivar package to account for the 'makeguids'
tool. Previously it was not too cumbersome to work around building that
tool for the host, but with the new build system it is increasingly
coupled with the target build that the least hacky way to work around it
is with a host package and a Makefile patch.
Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>