Added explicit 'void' to function that takes no argument

This is the correct way to tell that a function takes no
arguments, because an empty parameter list tells the compiler
that it is not yet defined, and is tolerated only for
compatibility with very old C compilers for whom prototypes
were not yet a defined language element.

WINGs/notification.c

@@ -437,7 +437,7 @@ WMEnqueueCoalesceNotification(WMNotificationQueue * queue,
 	}
 }
 
-void W_FlushASAPNotificationQueue()
+void W_FlushASAPNotificationQueue(void)
 {
 	WMNotificationQueue *queue = notificationQueueList;
 
@@ -451,7 +451,7 @@ void W_FlushASAPNotificationQueue()
 	}
 }
 
-void W_FlushIdleNotificationQueue()
+void W_FlushIdleNotificationQueue(void)
 {
 	WMNotificationQueue *queue = notificationQueueList;