win32: disable gdk_display_get_default ()->core_pointer
win32: disable gdk_display_get_default ()->core_pointer

I neither know how to trigger this code nor what would be
the suggested replacement API. BUt it's the last thing stopping
me to compile GTK3 for win32.

ebassi/gtk,grubersjoe/adwaita,davidgumberg/gtk,Adamovskiy/gtk,davidt/gtk,ebassi/gtk,alexlarsson/gtk,msteinert/gtk,Adamovskiy/gtk,Lyude/gtk-,Distrotech/gtk2,jadahl/gtk,Adamovskiy/gtk,chergert/gtk,simokivimaki/gtk,ebassi/gtk,jadahl/gtk,jessevdk/gtk,alexlarsson/gtk,jadahl/gtk,davidgumberg/gtk,ahodesuka/gtk,davidgumberg/gtk,ahodesuka/gtk,jigpu/gtk,chergert/gtk,jigpu/gtk,bratsche/gtk-,jessevdk/gtk,msteinert/gtk,bratsche/gtk-,bratsche/gtk-,msteinert/gtk,chergert/gtk,jessevdk/gtk,ebassi/gtk,davidt/gtk,simokivimaki/gtk,Distrotech/gtk2,jigpu/gtk,Lyude/gtk-,chergert/gtk,jigpu/gtk,davidt/gtk,davidgumberg/gtk,davidgumberg/gtk,davidgumberg/gtk,Distrotech/gtk2,jadahl/gtk,grubersjoe/adwaita,jigpu/gtk,jigpu/gtk,ahodesuka/gtk,Adamovskiy/gtk,ebassi/gtk,ahodesuka/gtk,ahodesuka/gtk,grubersjoe/adwaita,alexlarsson/gtk,jessevdk/gtk,Lyude/gtk-,jessevdk/gtk,Distrotech/gtk2,davidt/gtk,bratsche/gtk-,grubersjoe/adwaita,Sidnioulz/SandboxGtk,Sidnioulz/SandboxGtk,davidgumberg/gtk,grubersjoe/adwaita,jigpu/gtk,Sidnioulz/SandboxGtk,bratsche/gtk-,simokivimaki/gtk,Adamovskiy/gtk,Adamovskiy/gtk,simokivimaki/gtk,bratsche/gtk-,alexlarsson/gtk,davidgumberg/gtk,alexlarsson/gtk,ebassi/gtk,Sidnioulz/SandboxGtk,msteinert/gtk,chergert/gtk,jessevdk/gtk,ahodesuka/gtk,Adamovskiy/gtk,msteinert/gtk,davidt/gtk,chergert/gtk,grubersjoe/adwaita,jadahl/gtk,jessevdk/gtk,Distrotech/gtk2,Sidnioulz/SandboxGtk,grubersjoe/adwaita,msteinert/gtk,alexlarsson/gtk,simokivimaki/gtk,Lyude/gtk-,davidt/gtk,Sidnioulz/SandboxGtk,chergert/gtk,Adamovskiy/gtk,ahodesuka/gtk,Lyude/gtk-,chergert/gtk,Lyude/gtk-,jadahl/gtk,ahodesuka/gtk,Lyude/gtk-,Distrotech/gtk2,simokivimaki/gtk,jadahl/gtk,jadahl/gtk,jigpu/gtk,grubersjoe/adwaita,alexlarsson/gtk,Lyude/gtk-,alexlarsson/gtk