WINGs: Marked args as unused for compiler in widget resize callback code

WINGs dispatches window resize events using callback functions, which
means having a fixed argument list for that 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>

WINGs/wprogressindicator.c

@@ -139,6 +139,9 @@ static void didResizeProgressIndicator(W_ViewDelegate * self, WMView * view)
 	int width = pPtr->view->size.width;
 	int height = pPtr->view->size.height;
 
+	/* Parameter not used, but tell the compiler that it is ok */
+	(void) self;
+
 	assert(width > 0);
 	assert(height > 0);
 }