Fix clippy::needless_lifetimes in Rust 1.83 and ShimLock ABI on ia32

[nicholasbishop]

Checklist

• Sensible git history (for example, squash "typo" or "fix" commits). See the Rewriting History guide for help.
• Update the changelog (if necessary)

[nicholasbishop]

I'm not 100% sure that cdecl is what we want for ShimLock on ia32; the Rust docs are rather sparse, and shim doesn't document the protocol's ABI at all. But it at least compiles, which is better than sysv64.

[nicholasbishop]

Merging to unblock CI

[phip1611]

Thanks for fixing this!