Fix BACnet/IP builds for BBMD clients without BBMD tables. (#523)

* Fix BACnet/IP builds for BBMD clients without BBMD tables.

* added BBMD=client to pipeline build

---------

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

src/bacnet/datalink/dlenv.c

@@ -357,7 +357,9 @@ void dlenv_network_port_init(void)
 {
     const uint32_t instance = 1;
     BACNET_IP_ADDRESS addr = { 0 };
+#if BBMD_ENABLED
     uint8_t addr0, addr1, addr2, addr3;
+#endif
 
     Network_Port_Object_Instance_Number_Set(0, instance);
     Network_Port_Name_Set(instance, "BACnet/IP Port");