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

[ojeda]

ld.lld: warning <internal>:(.eh_frame) is being placed in ‘.eh_frame’ 

Similar to #1012, but this time, in samples/rust/rust_echo_server.rs in the rust branch.
See: #355.

@nbdd0121

[ojeda]

This is probably the one that Wedson noticed back then, and it is unrelated to the version upgrade -- I am removing the version from the title.

[ojeda]

Fix merged for Rust 1.73.0. Thanks @nbdd0121! I will test it with a future nightly to see if it fixes it.