Add 1 second penalty for every further target on PRIVMSG/NOTICE

This reduces the possibility of flooding channels with commands like
"PRIVMSG/NOTICE #a,#n,#c,... :message" a little bit.

Problem noticed by Cahata -- thanks!

src/ngircd/irc.c

@@ -494,6 +494,8 @@ Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 		}
 
 		currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
+		if (currentTarget)
+			Conn_SetPenalty(Client_Conn(Client), 1);
 	}
 
 	return CONNECTED;