Remove libc from dev deps #688

Job	Run time
clippy	18s
msrv (ubuntu-latest, 1.63)	1m 11s
msrv (windows-latest, 1.63)	1m 43s
fmt	16s
cross (ubuntu-latest)	2m 44s
cross (macos-latest)	39s
security_audit	2m 19s
test (ubuntu-latest, nightly)	1m 50s
test (ubuntu-latest, beta)	1m 48s
test (ubuntu-latest, stable)	1m 45s
test (windows-latest, nightly)	1m 37s
test (windows-latest, beta)	1m 15s
test (windows-latest, stable)	1m 44s
test (macos-latest, nightly)	1m 11s
test (macos-latest, beta)	53s
test (macos-latest, stable)	53s
test (windows-latest, nightly-x86_64-pc-windows-gnu)	2m 25s
test (windows-latest, nightly-i686-pc-windows-msvc)	2m 1s
test (windows-latest, nightly-i686-pc-windows-gnu)	2m 48s
wine	1m 38s
	30m 58s

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