codgen: detect cairo/graphene/Adwaita/Handy/GtkSourceview types
codgen: detect cairo/graphene/Adwaita/Handy/GtkSourceview types

This should probably be rewritten someday to make use of some other config options

GuillaumeGomez/gir,gtk-rs/gir,gtk-rs/gir,GuillaumeGomez/gir,gtk-rs/gir,GuillaumeGomez/gir