Import libmagic 5.16 magic database.
Apply Bro-specific mods to new 5.16 database.
Merge remote-tracking branch 'origin/topic/jsiwek/libmagic-integration'

* origin/topic/jsiwek/libmagic-integration:
  Apply Bro-specific mods to new 5.16 database.
  Import libmagic 5.16 magic database.