chore(deps): update rust crate libc to v0.2.168 #259

Job	Run time
cargo clippy -- -D warnings (ubuntu-latest)	9s
Code Coverage (ubuntu-latest, unix)	1m 40s
cargo clippy -- -D warnings (macOS-latest)	14s
cargo check (ubuntu-latest)	20s
cargo fmt --all -- --check	7s
Code Coverage (macos-latest, macos)	1m 34s
cargo clippy -- -D warnings (windows-latest)	1m 22s
cargo check (macOS-latest)	12s
Code Coverage (windows-latest, windows)	3m 29s
cargo check (windows-latest)	2m 7s
cargo test (ubuntu-latest)	20s
cargo test (macOS-latest)	27s
cargo test (windows-latest)	1m 38s
	13m 39s

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