broadband-modem-qmi: avoid unused functions

Only applicable when building with WITH_NEWEST_QMI_COMMANDS.

  mm-broadband-modem-qmi.c:4741:1: error: ‘common_enable_disable_unsolicited_events_signal_strength’ defined but not used [-Werror=unused-function]
   4741 | common_enable_disable_unsolicited_events_signal_strength (GTask *task)
        | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  mm-broadband-modem-qmi.c:4528:1: error: ‘serving_system_indication_cb’ defined but not used [-Werror=unused-function]
   4528 | serving_system_indication_cb (QmiClientNas *client,
        | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
  mm-broadband-modem-qmi.c:3468:1: error: ‘common_enable_disable_unsolicited_registration_events_serving_system’ defined but not used [-Werror=unused-function]
   3468 | common_enable_disable_unsolicited_registration_events_serving_system (GTask *task)
        | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  mm-broadband-modem-qmi.c:2812:1: error: ‘get_serving_system_3gpp_ready’ defined but not used [-Werror=unused-function]
   2812 | get_serving_system_3gpp_ready (QmiClientNas *client,
        | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  mm-broadband-modem-qmi.c:1652:1: error: ‘get_signal_strength_ready’ defined but not used [-Werror=unused-function]
   1652 | get_signal_strength_ready (QmiClientNas *client,

src/mm-broadband-modem-qmi.c

@@ -1589,7 +1589,7 @@ get_signal_info_ready (QmiClientNas *client,
     qmi_message_nas_get_signal_info_output_unref (output);
 }
 
-#endif /* WITH_NEWEST_QMI_COMMANDS */
+#else /* WITH_NEWEST_QMI_COMMANDS */
 
 static gboolean
 signal_strength_get_quality_and_access_tech (MMBroadbandModemQmi *self,
@@ -1698,6 +1698,8 @@ get_signal_strength_ready (QmiClientNas *client,
     qmi_message_nas_get_signal_strength_output_unref (output);
 }
 
+#endif /* WITH_NEWEST_QMI_COMMANDS */
+
 static void
 load_signal_quality (MMIfaceModem *self,
                      GAsyncReadyCallback callback,
@@ -2586,6 +2588,8 @@ modem_3gpp_run_registration_checks_finish (MMIfaceModem3gpp *self,
     return g_task_propagate_boolean (G_TASK (res), error);
 }
 
+#if !defined WITH_NEWEST_QMI_COMMANDS
+
 static void
 common_process_serving_system_3gpp (MMBroadbandModemQmi *self,
                                     QmiMessageNasGetServingSystemOutput *response_output,
@@ -2842,7 +2846,7 @@ get_serving_system_3gpp_ready (QmiClientNas *client,
     qmi_message_nas_get_serving_system_output_unref (output);
 }
 
-#if defined WITH_NEWEST_QMI_COMMANDS
+#else /* WITH_NEWEST_QMI_COMMANDS */
 
 static gboolean
 process_common_info (QmiNasServiceStatus service_status,
@@ -3464,6 +3468,8 @@ ri_serving_system_or_system_info_ready (QmiClientNas *client,
     g_object_unref (task);
 }
 
+#if !defined WITH_NEWEST_QMI_COMMANDS
+
 static void
 common_enable_disable_unsolicited_registration_events_serving_system (GTask *task)
 {
@@ -3482,7 +3488,8 @@ common_enable_disable_unsolicited_registration_events_serving_system (GTask *tas
         task);
 }
 
-#if defined WITH_NEWEST_QMI_COMMANDS
+#else /* WITH_NEWEST_QMI_COMMANDS */
+
 static void
 common_enable_disable_unsolicited_registration_events_system_info (GTask *task)
 {
@@ -3500,6 +3507,7 @@ common_enable_disable_unsolicited_registration_events_system_info (GTask *task)
         (GAsyncReadyCallback)ri_serving_system_or_system_info_ready,
         task);
 }
+
 #endif /* WITH_NEWEST_QMI_COMMANDS */
 
 static void
@@ -4522,7 +4530,8 @@ system_info_indication_cb (QmiClientNas *client,
     if (mm_iface_modem_is_3gpp (MM_IFACE_MODEM (self)))
         common_process_system_info_3gpp (self, NULL, output);
 }
-#endif
+
+#else /* WITH_NEWEST_QMI_COMMANDS */
 
 static void
 serving_system_indication_cb (QmiClientNas *client,
@@ -4535,6 +4544,8 @@ serving_system_indication_cb (QmiClientNas *client,
         common_process_serving_system_cdma (self, NULL, output);
 }
 
+#endif
+
 static void
 common_setup_cleanup_unsolicited_registration_events (MMBroadbandModemQmi *self,
                                                       gboolean enable,
@@ -4714,6 +4725,8 @@ common_enable_disable_unsolicited_events_finish (MMBroadbandModemQmi  *self,
     return g_task_propagate_boolean (G_TASK (res), error);
 }
 
+#if !defined WITH_NEWEST_QMI_COMMANDS
+
 static void
 ser_signal_strength_ready (QmiClientNas *client,
                            GAsyncResult *res,
@@ -4771,7 +4784,7 @@ common_enable_disable_unsolicited_events_signal_strength (GTask *task)
         task);
 }
 
-#if defined WITH_NEWEST_QMI_COMMANDS
+#else /* WITH_NEWEST_QMI_COMMANDS */
 
 static void
 ri_signal_info_ready (QmiClientNas *client,