_backend_gdk.c on win32

Just trying to build 0.73 on win32 and hot a snag on the new

    > _backend_gdk. My GTK win32 install, admittedly a bit out of
    > date, does not have

    > #include <gdk/gdkx.h>


I used the time honored "comment it out and see what happens" and was
able to compile and run GTK and GTKAgg examples on win32. As I
understand it, gdkx is an X specific extension anyway.

Are there problems with this approach?