Add support for HermitOS #837

Job	Run time
cross (ubuntu-latest)	1m 21s
fmt	3s
cross (macos-latest)	21s
msrv (ubuntu-latest)	1m 16s
clippy	19s
msrv (windows-latest)	1m 30s
security_audit	8s
test (ubuntu-latest, nightly)	1m 42s
wine	1m 26s
test (ubuntu-latest, beta)	1m 43s
test (ubuntu-latest, stable)	1m 38s
test (windows-latest, nightly)	1m 46s
test (windows-latest, beta)	1m 46s
test (windows-latest, stable)	2m 2s
test (macos-latest, nightly)	1m 22s
test (macos-latest, beta)	1m 22s
test (macos-latest, stable)	1m 22s
test (windows-latest, nightly-x86_64-pc-windows-gnu)	2m 12s
test (windows-latest, nightly-i686-pc-windows-msvc)	2m 5s
test (windows-latest, nightly-i686-pc-windows-gnu)	2m 38s
	28m 2s

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