Fix nrUE build error due to depndency of nas_nrue_task from RFSIM_NAS macro

executables/nr-uesoftmodem.c

@@ -192,11 +192,12 @@ int create_tasks_nrue(uint32_t ue_nb) {
       LOG_E(NR_RRC, "Create task for RRC UE failed\n");
       return -1;
     }
-
+#if defined(ITTI_SIM) || defined(RFSIM_NAS)
   if (itti_create_task (TASK_NAS_NRUE, nas_nrue_task, NULL) < 0) {
     LOG_E(NR_RRC, "Create task for NAS UE failed\n");
     return -1;
   }
+#endif
   }
 
   itti_wait_ready(0);