fix unused function paramters warning when building for wayland only

Signed-off-by: Chris Michael <cp.michael@samsung.com>

src/bin/e_alert.c

@@ -28,6 +28,9 @@ e_alert_composite_win(Ecore_X_Window root, Ecore_X_Window comp)
      ecore_x_window_prop_property_del(root, composite_win);
    else
      ecore_x_window_prop_card32_set(root, composite_win, &comp, 1);
+#else
+   (void)root;
+   (void)comp;
 #endif
 }