[mkgmap-dev] Commit r4474: implement support for --copyright-file and --copyright-message option in PolishReader.

Version mkgmap-r4474 was committed by gerd on Mon, 23 Mar 2020 implement support for --copyright-file and --copyright-message option in PolishReader. (mp-copyright.patch) http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4474