[mkgmap-dev] Commit r4388: fix unlikely but possible error in LinkDestinationHook: Don't use HashSet() to collect Coord instances, use Collections.newSetFromMap(new IdentityHashMap<Coord, Boolean>()) to avoid that coords with equal locations are filtered.

Version mkgmap-r4388 was committed by gerd on Wed, 11 Dec 2019 fix unlikely but possible error in LinkDestinationHook: Don't use HashSet() to collect Coord instances, use Collections.newSetFromMap(new IdentityHashMap<Coord, Boolean>()) to avoid that coords with equal locations are filtered. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4388