Use ${S} to pass ${SYSDIR} to ports.  This makes PORTS_MODULES feature work when compiling a kernel via "make buildkernel".
Use ${S} to pass ${SYSDIR} to ports.  This makes PORTS_MODULES
feature work when compiling a kernel via "make buildkernel".

Noticed and tested by:	nork

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