Update efibootmgr to version 18 / rev 32 via SR 1071187
    
    https://build.opensuse.org/request/show/1071187
    by user msmeissn + dimstar_suse
    - Update to v18
      * fixed the simple run example
      * Restore activation error message in efibootmgr
      * remove-dupes: update error message
      * Fix typo in manual page
      * README: Note efivarfs as the current required kernel module
      * Fix possible read out of bounds in ucs2_to_utf8
      * Add code of conduct
      * Fix help messages
      * Add option for insertion location of new entries
    - Rebase efibootmgr-delete-multiple.diff