Remove variable added by ru@ in r94940 that is no longer used by source or ports in share/mk/sys.mk
Remove variable added by ru@ in r94940 that is no longer used by source or ports in share/mk/sys.mk

PR:		conf/155737
Reviewed by:	ed (two years ago!)
Exp-Run by:	bdrewery

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