[mkgmap-dev] Commit r4159: area_size.patch: allows to use area_size() style function

Version mkgmap-r4159 was committed by gerd on Fri, 13 Apr 2018 area_size.patch: allows to use area_size() style function in lines style for members of type=multipolygon and type=boundary relations. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4159