sys: Fix the libc imports in the predefined code
sys: Fix the libc imports in the predefined code

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