Include x11/gdkx.h only when building for X11.

Include x11/gdkx.h only when building for X11.

2000-10-25  Tor Lillqvist  <tml@iki.fi>

	* gdk/gdkwindow.c: Include x11/gdkx.h only when building for X11.

	* gdk/win32/gdkdrawable-win32.c
	* gdk/win32/gdkimage-win32.c
	* gdk/win32/gdkprivate-win32.h: Corresponding changes as in the
	X11 backend.

	* gdk/win32/gdkcc-win32.c
	* gdk/win32/gdkcolor-win32.c
	* gdk/win32/gdkfont-win32.c
	* gdk/win32/gdkinput-win32.c
	* gdk/win32/gdkmain-win32.c
	* gdk/win32/gdkproperty-win32.c: Silence gcc -Wall.