[skip ci] allow to copy local mapnik SDK when doing local dev
[skip ci] allow to copy local mapnik SDK when doing local dev

tomhughes/node-mapnik,mapnik/node-mapnik,mapnik/node-mapnik,langateam/node-mapnik,langateam/node-mapnik,langateam/node-mapnik,CartoDB/node-mapnik,langateam/node-mapnik,langateam/node-mapnik,mapnik/node-mapnik,mapnik/node-mapnik,CartoDB/node-mapnik,CartoDB/node-mapnik,tomhughes/node-mapnik,mapnik/node-mapnik,CartoDB/node-mapnik,tomhughes/node-mapnik,CartoDB/node-mapnik,tomhughes/node-mapnik,tomhughes/node-mapnik