Fix follow links when d/l'ing c api for Windows
Fix follow links when d/l'ing c api for Windows

niccaluim/go-mapnik,sjsafranek/go-mapnik,fawick/go-mapnik,sjsafranek/go-mapnik,niccaluim/go-mapnik,niccaluim/go-mapnik,sjsafranek/go-mapnik,fawick/go-mapnik,niccaluim/go-mapnik,niccaluim/go-mapnik,sjsafranek/go-mapnik,fawick/go-mapnik,sjsafranek/go-mapnik