Bugfix/atmel studio arm compile warnings (#60)

* Cleanup warnings generated by Atmel Studio compiling for SAMD21 ARM

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

src/bacnet/basic/service/h_apdu.c

@@ -48,11 +48,6 @@
 
 /** @file apdu.c  Handles APDU services */
 
-extern int Routed_Device_Service_Approval(BACNET_CONFIRMED_SERVICE service,
-    int service_argument,
-    uint8_t *apdu_buff,
-    uint8_t invoke_id);
-
 /* APDU Timeout in Milliseconds */
 static uint16_t Timeout_Milliseconds = 3000;
 /* Number of APDU Retries */
@@ -140,7 +135,7 @@ bool apdu_service_supported(BACNET_SERVICES_SUPPORTED service_supported)
             if (confirmed_service_supported[i] == service_supported) {
                 found = true;
                 if (Confirmed_Function[i] != NULL) {
-#if BAC_ROUTING
+#ifdef BAC_ROUTING
                     /* Check to see if the current Device supports this service.
                      */
                     int len = Routed_Device_Service_Approval(

src/bacnet/basic/service/h_dcc.c

@@ -158,7 +158,7 @@ void handler_device_communication_control(uint8_t *service_request,
             "Sending Reject - undefined enumeration\n");
 #endif
     } else {
-#if BAC_ROUTING
+#ifdef BAC_ROUTING
         /* Check to see if the current Device supports this service. */
         len = Routed_Device_Service_Approval(
             SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL, (int)state,

src/bacnet/basic/service/h_rd.c

@@ -123,7 +123,7 @@ void handler_reinitialize_device(uint8_t *service_request,
             "ReinitializeDevice: Sending Reject - undefined enumeration\n");
 #endif
     } else {
-#if BAC_ROUTING
+#ifdef BAC_ROUTING
         /* Check to see if the current Device supports this service. */
         len = Routed_Device_Service_Approval(
             SERVICE_CONFIRMED_REINITIALIZE_DEVICE, (int)rd_data.state,