efivar 0.23
- Work with gcc 6 / binutils 2.26
- get the immutable bits of variable edit/delete cycles right
- get the byte order right in all representations of guids
- link correctly without a previous version of efivar installed
- don't have a 1 in some representations of efi_guid_empty / efi_guid_zero
- compile without -fshort-wchar
- work slightly better with clang