Substitute gdkx.h => gdkprivate.h since we need to accesss only

Substitute gdkx.h => gdkprivate.h since we need to accesss only

Mon Nov  8 16:40:43 1999  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkwidget.c: Substitute gdkx.h => gdkprivate.h since
	we need to accesss only ->children. We need an accessor
	for the children.

	* gtk/gtkhandlebox.c gtk/testgtk.c: Substitute G
	DK_ROOT_PARENT() => NULL, in call to gtk_window_get_pointer()
	to get rid of gdkx.h include.

	* gtk/gtkctree.c: Get rid of #include <gdk/gdkx.h>
	and random references to 'None'.

	* gtk/gtkclist.c gtk/gtkeditable.c gtk/gtkpreview.c
	Get rid of unused #include <gdk/gdkx.h>

	* gtk/gtkrc.c gtk/gtkmain.c: Get rid of #include <gdk/gdkx.h>
	gdkx.h is _X_ specific stuff. GDK_WINDOWING comes from
	gdkconfig.h.