Add 'proj_version' check + define PROJ_MIN_VERSION as 7.2.0
Add 'proj_version' check + define PROJ_MIN_VERSION as 7.2.0

tomhughes/mapnik,mapnik/mapnik,tomhughes/mapnik,mapnik/mapnik,mapnik/mapnik,lightmare/mapnik,lightmare/mapnik,lightmare/mapnik,tomhughes/mapnik,tomhughes/mapnik,lightmare/mapnik,mapnik/mapnik