Reflex is using a really old nixpkgs so we need to use a comparably old
nixpkgs to get a versions of glibc that has enough binary compatibility with
the version in Reflex's nixpkgs that the cbr .so will link against it, since
that's what we turn around and do with it.

libchallenge_bypass_ristretto_ffi

Oops the armv7a lib directory also has the Aarch64.  Whatever.

To do: Call a function from the library and put its return value on a web
page.

`nix build` will build you an aarch64 android .so