keep using rpath for linux in case OSRM starts providing shared libs
keep using rpath for linux in case OSRM starts providing shared libs

KnockSoftware/node-osrm,oxidase/node-osrm,Project-OSRM/node-osrm,KnockSoftware/node-osrm,Project-OSRM/node-osrm,KnockSoftware/node-osrm,oxidase/node-osrm,oxidase/node-osrm,KnockSoftware/node-osrm,Project-OSRM/node-osrm