Update to version 15 - Make efibootmgr use EFIDIR / efibootmgr.efidir like fwupdate does - make --loader default build-time configurable - sanitize set_mirror()/get_mirror() - Add support for parsing loader options as UCS2 - GCC 7 fixes - Don't use -fshort-wchar since we don't run on EFI machines.