* gdk/win32/gdkwindow-win32.c (gdk_window_new): Assure title is
non-NULL.
* gtk/gtkdnd.c
* gtk/gtklayout.c
* gtk/gtkplug.c
* gtk/gtkselection.c
* gtk/gtksocket.c
* gtk/gtkwindow.c: Include x11/gdkx.h *or* win32/gdkwin32.c as
appropriate. There must be a cleaner way to handle this?
* gtk/gtkrc.c: Must include windows.h on Win32.
* gtk/testgtk.c: No need to include gdkx.h.
* gtk/makefile.cygwin: Correct invokation of genmarshal.pl.