`.eh_frame` section emitted for `rust_echo_server.o`

```txt
ld.lld: warning <internal>:(.eh_frame) is being placed in ‘.eh_frame’ 
```

Similar to https://github.com/Rust-for-Linux/linux/issues/1012, but this time, in `samples/rust/rust_echo_server.rs` in the `rust` branch.
See: https://github.com/Rust-for-Linux/linux/issues/355.

@nbdd0121