fix compile error on some builds by doing the equivalent of an "extern VNET_DEFINE" without "__used"
fix compile error on some builds by doing the equivalent of
an "extern VNET_DEFINE" without "__used"

MFC after:	3 days

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