add HermitOS support to branch v0.8.x #443

Job	Run time
Docs	18s
Check (armv7-sony-vita-newlibeabihf)	35s
CheckTargets	1m 7s
Check (sparcv9-sun-solaris)	34s
Clippy	15s
Check (x86_64-pc-solaris)	32s
MinimalVersions (ubuntu-latest)	22s
MSRV (ubuntu-latest)	1m 34s
MinimalVersions (macos-latest)	26s
Nightly	22s
MSRV (windows-latest)	2m 6s
Rustfmt	12s
MinimalVersions (windows-latest)	40s
Sanitizer (address)	57s
Test (ubuntu-latest)	44s
TestPoll	40s
Sanitizer (leak)	50s
Test (macos-latest)	41s
TestWakerPipe	28s
Sanitizer (memory)	1m 39s
Test (windows-latest)	2m 9s
Sanitizer (thread)	59s
Passed	0s
	18m 10s

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