Adds further [[fallthrough]] attributes.

Components/5380/ncr5380.cpp

@@ -263,6 +263,7 @@ void NCR5380::scsi_bus_did_change(SCSI::Bus *, SCSI::BusState new_state, double
 		case ExecutionState::WaitingForBusy:
 			if(!(new_state & SCSI::Line::Busy) || time_since_change < SCSI::DeskewDelay) return;
 			state_ = ExecutionState::WatchingBusy;
+			[[fallthrough]];
 
 		case ExecutionState::WatchingBusy:
 			if(!(new_state & SCSI::Line::Busy)) {

Components/DiskII/IWM.cpp

@@ -307,8 +307,8 @@ void IWM::run_for(const Cycles cycles) {
 			} else {
 				shift_register_ = sense();
 			}
+			[[fallthrough]];
 
-		/* Deliberate fallthrough. */
 		default:
 			if(drive_is_rotating_[active_drive_]) drives_[active_drive_]->run_for(cycles);
 		break;