GtkButtonBox doesn't do height-for-width
GtkButtonBox doesn't do height-for-width

GtkButtonBox doesn't do height-for-width, therefore we should
explicitly set these methods to NULL instead of hoping that the
inherited GtkBox implementations work ok.

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