i686-unknown-uefi has started failing

[nicholasbishop]

With latest nightly, compilation is failing with:

  = note: rust-lld: error: /safeseh: /tmp/rustcsn785E/symbols.o is not compatible with SEH
          rust-lld: warning: section name .debug_frame is longer than 8 characters and will use a non-standard string table

(from https://github.com/rust-osdev/uefi-rs/runs/6198792816?check_suite_focus=true)

[nicholasbishop]

I'm running cargo-bisect-rustc now to find where it failed using the template app as my test case:

cargo bisect-rustc --with-src -- build --target i686-unknown-uefi

[nicholasbishop]

Filed a rust bug: rust-lang/rust#96498

[nicholasbishop]

Rust bug has been fixed, and CI is passing again.