add support of HermitOS #406

Job	Run time
CheckTargets	1m 23s
Clippy	14s
Docs	12s
Check (aarch64-apple-ios)	32s
MinimalVersions (ubuntu-latest)	23s
Check (aarch64-apple-tvos)	32s
MSRV (ubuntu-latest)	12s
Nightly	21s
Check (aarch64-unknown-openbsd)	34s
MinimalVersions (macos-latest)	32s
MSRV (macos-latest)	22s
Check (arm64_32-apple-watchos)	34s
MinimalVersions (windows-latest)	10m 3s
MSRV (windows-latest)	24s
Check (armv7-sony-vita-newlibeabihf)	33s
Rustfmt	7s
Check (sparcv9-sun-solaris)	34s
Sanitizer (address)	55s
Check (x86_64-pc-solaris)	31s
Test (ubuntu-latest)	53s
Sanitizer (leak)	44s
TestPoll	30s
Test (macos-latest)	1m 41s
Check (x86_64-unknown-dragonfly)	35s
Sanitizer (memory)	1m 37s
Test (windows-latest)	1m 54s
Check (x86_64-unknown-openbsd)	29s
Sanitizer (thread)	51s
TestWakerPipe	33s
Passed	0s
	28m 45s

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