__SIZEOF_INT__ and __SIZEOF_POINTER__ may not be defined.
__SIZEOF_INT__ and __SIZEOF_POINTER__ may not be defined.

Protect __SIZEOF_INT__ and __SIZEOF_POINTER__ with an ifdef to prevent
warnings about them not being defined when including gtktextattributes.h.

https://bugzilla.gnome.org/show_bug.cgi?id=660619

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