[mkgmap-dev] Commit r4158: expr-func2.patch by Steve Ratcliffe

Version mkgmap-r4158 was committed by gerd on Fri, 13 Apr 2018 expr-func2.patch by Steve Ratcliffe corrects handling of expresions like c!=d & a=$b http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4158