ASNDerCalcMechListLength
nMechListLength = ASNDerCalcMechListLength(mechOidLst, mechOidCnt, &nInternalLength);
long ASNDerCalcMechListLength( SPNEGO_MECH_OID *mechOidLst, int mechOidCnt,
nTempLength += ASNDerCalcMechListLength( mechOidLst, mechOidCnt, NULL );
nTempLength = ASNDerCalcMechListLength( pMechTypeList, MechTypeCnt, &nInternalLength );