[mkgmap-dev] Commit r4216: correct DouglasPeuckerFilter: Never remove the first or last point of a way.

Version mkgmap-r4216 was committed by gerd on Fri, 03 Aug 2018 correct DouglasPeuckerFilter: Never remove the first or last point of a way. In opposite to the javadoc the method sometimes removed the last point because of some special handling introduced long ago. This introduces problems when the code is called by WrongAngleFixer, because the preserved flag is not yet set. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4216