freetdm: - updated all signaling modules (except for ftmod_isdn and ftmod_sangoma_ss7) to adapt to new core state processing

- fixed bug in configure.ac to detect ftmod_pritap compilation
         - ignore FTDM_SIGEVENT_RELEASED and FTDM_SIGEVENT_INDICATION_COMPLETED in mod_freetdm
         - Destroy the state completed interrupt on channel destroy
         - Fix analog polarity reversal bug when using 3-way calling or call-swap

libs/freetdm/src/ftdm_io.c

@@ -615,6 +615,9 @@ static ftdm_status_t ftdm_channel_destroy(ftdm_channel_t *ftdmchan)
 
 		ftdm_mutex_destroy(&ftdmchan->mutex);
 		ftdm_mutex_destroy(&ftdmchan->pre_buffer_mutex);
+		if (ftdmchan->state_completed_interrupt) {
+			ftdm_interrupt_destroy(&ftdmchan->state_completed_interrupt);
+		}
 	}
 	
 	return FTDM_SUCCESS;