Update b4 to version 0.8.0+0 / rev 20 via SR 915660
    
    https://build.opensuse.org/request/show/915660
    by user jirislaby + dimstar_suse
    - Update to version 0.8.0+0:
      * Normalize linebreaks when reconstituting body
      * Document listid-preference config parameter
      * Missed backfill call cleanup
      * Remove kludges that were needed before /all/
      * Filter duplicate results when querying new series
      * Move dedupe code into central location
      * Reimplement deduping based on list-id preference
      * When deduping, prefer DKIM-validating messages
      * Handle decoding incorrectly encoded headers
      * Parse just headers when extracting message ID from stdin mbox
      * Avoid decoding errors when extracting message ID from stdin
      * Don't consider signature contents for trailers
      * Sanitize msgid before using it as savename
      * Fix wrong statement on patches without indexes
      * Allow '.git' to be a file for worktrees
      * Tweak --guess-ba