Add support for HermitOS #834

Job	Run time
fmt	29s
msrv (ubuntu-latest)	1m 11s
clippy	5s
cross (ubuntu-latest)	1m 31s
msrv (windows-latest)	1m 48s
cross (macos-latest)	20s
security_audit	11s
test (ubuntu-latest, nightly)	1m 45s
wine	1m 38s
test (ubuntu-latest, beta)	1m 45s
test (ubuntu-latest, stable)	1m 54s
test (windows-latest, nightly)	2m 4s
test (windows-latest, beta)	2m 5s
test (windows-latest, stable)	2m 52s
test (macos-latest, nightly)	1m 21s
test (macos-latest, beta)	1m 19s
test (macos-latest, stable)	1m 18s
test (windows-latest, nightly-x86_64-pc-windows-gnu)	2m 16s
test (windows-latest, nightly-i686-pc-windows-msvc)	2m 30s
test (windows-latest, nightly-i686-pc-windows-gnu)	2m 27s
	30m 49s

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