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efibootmgr 13

- Add support for --sysprep and --driver to support UEFI System Prep
  Applications and UEFI Drivers.
- use efivar's error reporting facility, and show error traces when
  "-v -v" is used.
- Still yet better error codes returned on failures.
- Add -m and -M to support Memory Address Range Mirroring.
- Add efibootdump, to examine Boot* variables found in tarballs in bug
  reports and similar.
- miscellaneous bugfixes.