Use relative symlinks so they work even when ${DESTDIR} is not empty.
Use relative symlinks so they work even when ${DESTDIR} is not empty.

Reviewed by:	jkh, bde

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase