sys: Add version features to Cargo.toml
sys: Add version features to Cargo.toml

gtk-rs/gir,GuillaumeGomez/gir,EPashkin/gir,GuillaumeGomez/gir,gkoz/gir,gtk-rs/gir,GuillaumeGomez/gir,gtk-rs/gir,gkoz/gir,EPashkin/gir