gtk2 rbgtkmenutoolbutton.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkwindow.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkcellrenderer.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtktoolitem.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtktargetlist.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkiconview.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkaccelerator.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgdkdraw.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkimage.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkfilefliter.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkactiongroup.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkaboutdialog.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgdkpangorenderer.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkaction.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkcellview.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkdisplay.c: drop GTK_CHECK_VERSION(2,6,0)
gtk2 rbgtkclipboard.c: drop GTK_CHECK_VERSION(2,6,0)