efivar 38-3 broken; replace with efivar 39

[Jim Bray <jimbray@protonmail.com>]

Hi,

efivar 38-3.1build1 is broken, SIGSEGVs if one tries to import (it free()s a null ptr).

# efivar -i test.export

Segmentation fault

This is fixed in the current release, 39, https://github.com/rhboot/efivar/releases (I pulled, built and tested).

Cheers,

Jim