wmaker: Marked args as unused for compiler in WINGs callback code

The WINGs toolkit dispatch events on widgets using callbacks, which means
having a fixed argument list for the handling function.

It is then correct to not use all the arguments, so this patch adds the
appropriate stuff to avoid a false report from compiler.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

src/dialog.c

@@ -105,6 +105,9 @@ int wMessageDialog(WScreen *scr, const char *title, const char *message, const c
 
 static void toggleSaveSession(WMWidget *w, void *data)
 {
+	/* Parameter not used, but tell the compiler that it is ok */
+	(void) data;
+
 	wPreferences.save_session_on_exit = WMGetButtonSelected((WMButton *) w);
 }
 
@@ -715,6 +718,9 @@ static void drawIconProc(WMList * lPtr, int index, Drawable d, char *text, int s
 	RColor color;
 	int x, y, width, height, len;
 
+	/* Parameter not used, but tell the compiler that it is ok */
+	(void) index;
+
 	if (!panel->preview)
 		return;
 
@@ -1500,6 +1506,9 @@ static void okButtonCallback(void *self, void *clientData)
 {
 	CrashPanel *panel = (CrashPanel *) clientData;
 
+	/* Parameter not used, but tell the compiler that it is ok */
+	(void) self;
+
 	panel->done = True;
 }