[mkgmap-dev] Commit r3814: revert changes from r3771 to MultiPolygonRelation

Version mkgmap-r3814 was committed by gerd on Fri, 17 Feb 2017 revert changes from r3771 to MultiPolygonRelation They cause problems when generate-sea is used instead of precomp-sea http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3814