ion pulls nix 0.23.1 (git), which has the Redox SaFlags_t=c_ulong bug
(relibc/libc use c_int) and fails to compile on a clean rebuild with the
`kill`/signal feature. ion was only a bundled initfs recovery shell that
nothing execs (init runs daemons then switchroots to /usr, where the
interactive login shell is brush). Per operator directive, drop ion rather
than hold nix back on an ancient pinned version for its sake.
vasilito
5f99f19411