libc: 0.2.79 -> 0.2.80

[nagisa]

This PR bumps the version of the libc crate from 0.2.79 to 0.2.80 in order to hopefully fix a build failure when building the standard library for the tier 3 x86_64-unknown-dragonfly target.

[rust-highfive]

r? @Mark-Simulacrum

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[nagisa]

cc @JohnTitor

[Mark-Simulacrum]

I generally ask that such PRs also bump the libc dep in a Cargo.toml somewhere in the workspace, so we don't accidentally regress in a future PR when rebasing across this change (I've done it before myself, and only noticed when looking at the diff, which for larger Cargo.lock changes is a bit untenable). r=me with that done.

[nagisa]

@bors r=Mark-Simulacrum

[bors]

📌 Commit 00abef1 has been approved by Mark-Simulacrum

[jonas-schievink]

@bors rollup=iffy r- failed in #78451 (comment)

[crlf0710]

Triage: What's the status of this?

[nagisa]

There are outstanding issues that need to be resolved before this can land. It still needs to land some day, though, but it likely will be a bump to a different libc version.