Add `#![allow(improper_ctypes)]` to extern-pass-empty.rs; note this test seems bogus.
Add `#![allow(improper_ctypes)]` to extern-pass-empty.rs; note this test seems bogus.

that is, I suspect it should be retired because it is testing behavior
(namely a `#[repr(C)] struct Empty;`) that, if I understand correctly,
is undefined.

See also rust-lang/rust#53859.

graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,graydon/rust,graydon/rust,graydon/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust