add support of HermitOS #385

Job	Run time
Clippy	16s
Docs	10s
Check (aarch64-apple-ios)	31s
CheckTargets	1m 33s
Check (aarch64-apple-tvos)	33s
MinimalVersions (ubuntu-latest)	21s
Check (aarch64-unknown-openbsd)	35s
MSRV (ubuntu-latest)	17s
MinimalVersions (macos-latest)	49s
Check (arm64_32-apple-watchos)	29s
Nightly	21s
MSRV (macos-latest)	37s
MinimalVersions (windows-latest)	1m 0s
Check (armv7-sony-vita-newlibeabihf)	33s
MSRV (windows-latest)	26s
Check (sparcv9-sun-solaris)	30s
Rustfmt	2m 6s
Check (x86_64-pc-solaris)	30s
Sanitizer (address)	56s
Test (ubuntu-latest)	41s
Check (x86_64-unknown-dragonfly)	32s
Sanitizer (leak)	3m 15s
Test (macos-latest)	55s
Check (x86_64-unknown-openbsd)	29s
TestPoll	27s
Sanitizer (memory)	1m 41s
Test (windows-latest)	2m 19s
Sanitizer (thread)	52s
TestWakerPipe	29s
Passed	1s
	24m 14s

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