Remove unused signal

libs/ardour/ardour/route.h

@@ -401,8 +401,6 @@ public:
 	PBD::Signal0<void> processor_latency_changed;
 	/** the metering point has changed */
 	PBD::Signal0<void> meter_change;
-	/** route has updated its latency compensation */
-	PBD::Signal0<void> signal_latency_updated;
 
 	/** Emitted with the process lock held */
 	PBD::Signal0<void>       io_changed;

libs/ardour/route.cc

@@ -4329,10 +4329,6 @@ Route::apply_latency_compensation ()
 #endif
 
 		_delayline->set_delay (latcomp > 0 ? latcomp : 0);
-
-		if (old !=  _delayline->delay ()) {
-			signal_latency_updated (); /* EMIT SIGNAL */
-		}
 	}
 }