update GUI example building script

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1212 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/gui/SConscript

@@ -22,6 +22,9 @@ demo_view_progressbar.c
 demo_view_radiobox.c
 demo_view_listbox.c
 demo_view_slider.c
+demo_view_combobox.c
+demo_view_listctrl.c
+demo_view_menu.c
 demo_view_scrollbar.c
 demo_view_textbox.c
 demo_view_window.c