[mkgmap-dev] Commit r4574: correction: In rare cases a multipolygon was ignored.

Version mkgmap-r4574 was committed by gerd on Sat, 12 Sep 2020 correction: In rare cases a multipolygon was ignored. This happened when none of the polygon points was inside the tile and an edge of the MP crossed the tile bounds. Thanks to Ranko Jaksic for reporting this very old bug. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4574