Build mkgmap/mkgmap #1248

fix another " Internal error: Failed to render MultiPolygonRelation" Have to return Double.MAX_VALUE instead of -1 in getMaxCloseDist() to signal that any distance is OK In trunk the value was ignored when it was negative, so the results from the branch should be closer to trunk. Closing the ring of a MP inside the tile bounds means that possibly invalid data is rendered. Don't remember if I changed the code to avoid that or if it was accidential.