gtk2 rbgtkstatusicon.c: drop GTK_CHECK_VERSION(2,10,0)
gtk2 rbgtktreestore.c: drop GTK_CHECK_VERSION(2,10,0)
gtk2 rbgtkpagesetup.c: drop GTK_CHECK_VERSION(2,10,0)
gtk2 rbgtkstyle.c: drop GTK_CHECK_VERSION(2,10,0)
gtk2 rbgtkwidget.c: drop GTK_CHECK_VERSION(2,10,0)
gtk2 rbgtkcairo.c: drop GTK_CHECK_VERSION(2,10,0)