build fix for win32
build fix for win32

jwomeara/PDAL,mtCarto/PDAL,boundlessgeo/PDAL,verma/PDAL,verma/PDAL,jwomeara/PDAL,radiantbluetechnologies/PDAL,mtCarto/PDAL,Sciumo/PDAL,lucadelu/PDAL,lucadelu/PDAL,jwomeara/PDAL,mpgerlek/PDAL-old,lucadelu/PDAL,verma/PDAL,mtCarto/PDAL,radiantbluetechnologies/PDAL,Sciumo/PDAL,mpgerlek/PDAL-old,boundlessgeo/PDAL,DougFirErickson/PDAL,DougFirErickson/PDAL,mtCarto/PDAL,mpgerlek/PDAL-old,jwomeara/PDAL,radiantbluetechnologies/PDAL,DougFirErickson/PDAL,DougFirErickson/PDAL,lucadelu/PDAL,radiantbluetechnologies/PDAL,boundlessgeo/PDAL,verma/PDAL,verma/PDAL,boundlessgeo/PDAL,mpgerlek/PDAL-old,Sciumo/PDAL,Sciumo/PDAL,verma/PDAL,verma/PDAL