Windows: update mapnik SDK to v3.0.0-rc1-625-gea6677d
Windows: update mapnik SDK to v3.0.0-rc1-625-gea6677d

Uli1/node-mapnik,MaxSem/node-mapnik,mapnik/node-mapnik,stefanklug/node-mapnik,MaxSem/node-mapnik,stefanklug/node-mapnik,mapnik/node-mapnik,CartoDB/node-mapnik,CartoDB/node-mapnik,CartoDB/node-mapnik,stefanklug/node-mapnik,tomhughes/node-mapnik,CartoDB/node-mapnik,MaxSem/node-mapnik,stefanklug/node-mapnik,langateam/node-mapnik,mapnik/node-mapnik,langateam/node-mapnik,langateam/node-mapnik,mapnik/node-mapnik,tomhughes/node-mapnik,tomhughes/node-mapnik,tomhughes/node-mapnik,Uli1/node-mapnik,Uli1/node-mapnik,langateam/node-mapnik,mapnik/node-mapnik,Uli1/node-mapnik,langateam/node-mapnik,CartoDB/node-mapnik,MaxSem/node-mapnik,tomhughes/node-mapnik