Add "NO_CXX" knob to match src/gnu/usr.bin/cc/Makefile.
Add "NO_CXX" knob to match src/gnu/usr.bin/cc/Makefile.

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