Removed a stale reference to libpc.pc
Removed a stale reference to libpc.pc

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