MSVC Builds: Fix Introspection Builds
MSVC Builds: Fix Introspection Builds

Commit e26bdbda only partially made the necessary changes due to the use of
the deprecated headers in GDK.  Fix that.

Adamovskiy/gtk,ahodesuka/gtk,alexlarsson/gtk,Lyude/gtk-,jessevdk/gtk,alexlarsson/gtk,jadahl/gtk,jigpu/gtk,davidgumberg/gtk,chergert/gtk,alexlarsson/gtk,grubersjoe/adwaita,jigpu/gtk,ahodesuka/gtk,Lyude/gtk-,Lyude/gtk-,jadahl/gtk,davidgumberg/gtk,grubersjoe/adwaita,grubersjoe/adwaita,jadahl/gtk,Adamovskiy/gtk,davidgumberg/gtk,ahodesuka/gtk,grubersjoe/adwaita,chergert/gtk,jigpu/gtk,jessevdk/gtk,davidgumberg/gtk,jessevdk/gtk,Adamovskiy/gtk,grubersjoe/adwaita,chergert/gtk,davidgumberg/gtk,jigpu/gtk,chergert/gtk,jessevdk/gtk,Lyude/gtk-,Adamovskiy/gtk,Adamovskiy/gtk,ahodesuka/gtk,davidgumberg/gtk,ahodesuka/gtk,ahodesuka/gtk,Adamovskiy/gtk,Lyude/gtk-,davidgumberg/gtk,Lyude/gtk-,grubersjoe/adwaita,Adamovskiy/gtk,jadahl/gtk,chergert/gtk,jigpu/gtk,jigpu/gtk,Adamovskiy/gtk,jessevdk/gtk,chergert/gtk,alexlarsson/gtk,jadahl/gtk,alexlarsson/gtk,grubersjoe/adwaita,jadahl/gtk,jadahl/gtk,jessevdk/gtk,grubersjoe/adwaita,Lyude/gtk-,alexlarsson/gtk,alexlarsson/gtk,davidgumberg/gtk,ahodesuka/gtk,chergert/gtk,jigpu/gtk,ahodesuka/gtk,alexlarsson/gtk,jadahl/gtk,chergert/gtk,jessevdk/gtk,jigpu/gtk,Lyude/gtk-