[mkgmap-dev] Commit r4314: fix assertion error when option --make-poi-index is used

Version mkgmap-r4314 was committed by gerd on Mon, 21 Oct 2019 fix assertion error when option --make-poi-index is used Regession from r4147 (img_io_3.patch) http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4314