ices/81208.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#81208

#[path = b"ffi.rs"]
mod ffi;

fn main() {}

=== stdout ===
=== stderr ===
error: byte constant must be ASCII. Use a \xHH escape for a non-ASCII byte
 --> /home/runner/work/glacier/glacier/ices/81208.rs:1:12
  |
1 | #[path = b"ffi.rs"]
  |            ^

error[E0583]: file not found for module `ffi`
 --> /home/runner/work/glacier/glacier/ices/81208.rs:2:1
  |
2 | mod ffi;
  | ^^^^^^^^
  |
  = help: to create the module `ffi`, create file "/home/runner/work/glacier/glacier/ices/ffi.rs"

error: malformed `path` attribute input
 --> /home/runner/work/glacier/glacier/ices/81208.rs:1:1
  |
1 | #[path = b"ffi.rs"]
  | ^^^^^^^^^^^^^^^^^ help: must be of the form: `#[path = "file"]`

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0583`.
==============