GtkBuilder: Fall back to gtk_test_register_all_types if type lookup fails
GtkBuilder: Fall back to gtk_test_register_all_types if type lookup fails

This is important because the dlsym() approach can fail if gtk was
loaded with RTLD_LOCAL.

https://bugzilla.gnome.org/show_bug.cgi?id=710096

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