redox_syscall no longer appropriate?

[mightyiam]

That said, redox_syscall is no longer meant to be used anywhere except for low-level userspace components like relibc and drivers, as Redox doesn't guarantee a stable syscall ABI. Instead, the libredox crate is recommended

This is from the private Redox OS/Dev Matrix room.

[Stebalien]

We don't actually use it for low-level syscalls, just to get the ENOSYS constant for errors. But it looks like I can just get that from rustix (through libc) so I'll drop the dep.