sys: Enable dead_code lints
sys: Enable dead_code lints

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