nix requires `ranlib`

Be forewarned: HER builds with nix require a functional ranlib This is something seldom known, and a very sharp corner to cut yourself on. But you really want to know if you are using nix. I lost an entire day trying to figure out mysterious “symbol not found” errors while trying to link a hermetic instance of the nvc VHDL compiler under bazel with rules_foreign_cc, in a HER build, when using…