A helper crate for nstd providing manipulation of an item.
- Mark function definitions as #[no_mangle].
- Set function ABIs to extern "C".
- Mark static item definitions as #[no_mangle].
- Set static item declaration ABIs to extern "C".
- Mark structures, enumerations, and unions as #[repr(C)].
- Implicitly enables capi.
- Turn function definitions into function declarations.
- Turn static item definitions into static item declarations.