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Auto merge of #114443 - tgross35:cstr-len, r=dtolnay
Implement `cstr_count_bytes`
This has not yet been approved via ACP, but it's simple enough to get started on.
- ACP: https://github.com/rust-lang/libs-team/issues/256
- Tracking issue: https://github.com/rust-lang/rust/issues/114441
`@rustbot` label +T-libs-api
