Clear `eval_libc` errors from unix shims #9205

Job	Run time
build (ubuntu-latest, x86_64-unknown-linux-gnu)	24m 40s
style checks	2m 37s
build (macos-14, aarch64-apple-darwin)	20m 29s
build (windows-latest, i686-pc-windows-msvc)	17m 6s
conclusion	1s
cronjob failure notification	0s
	1h 4m 53s

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