Update Rust crate libc to v0.2.168 #37456

Job	Run time
Determine changes	8s
cargo build (release)	0s
cargo fmt	19s
mkdocs	3m 1s
pre-commit	46s
python package	1m 42s
cargo test (windows)	5m 22s
cargo clippy	3m 4s
cargo test (linux)	2m 7s
cargo test (linux, release)	4m 1s
cargo build (msrv)	5m 57s
cargo shear	25s
cargo fuzz build	5m 21s
cargo test (wasm)	2m 5s
test scripts	2m 5s
benchmarks	5m 57s
formatter instabilities and black similarity	4m 36s
ecosystem	3m 56s
test ruff-lsp	36s
fuzz parser	5m 34s
	57m 2s

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