Libarchive 2.0.23:

Libarchive 2.0.23:
   * The ACL formatter was mis-formatting entries which had a
     user/group ID but no name.  Make the parser tolerant of
     these, so that old archives can be correctly restored;
     fix the formatter to generate correct entries.
   * Fix overwrite detection by introducing a new "FAILED" return
     code that indicates the current entry cannot be continued
     but the archive as a whole is still sound.
   * Header cleanup:  Remove some unused headers, add some that
     are required with new Linux systems.