add support of HermitOS #389

Job	Run time
Docs	4s
CheckTargets	1m 33s
Clippy	15s
Check (aarch64-apple-ios)	36s
MSRV (ubuntu-latest)	14s
Check (aarch64-apple-tvos)	32s
MinimalVersions (ubuntu-latest)	21s
Nightly	22s
MSRV (macos-latest)	20s
Check (aarch64-unknown-openbsd)	46s
MinimalVersions (macos-latest)	42s
MSRV (windows-latest)	39s
Check (arm64_32-apple-watchos)	31s
MinimalVersions (windows-latest)	44s
Check (armv7-sony-vita-newlibeabihf)	30s
Rustfmt	5s
Check (sparcv9-sun-solaris)	28s
Sanitizer (address)	56s
Check (x86_64-pc-solaris)	30s
Test (ubuntu-latest)	58s
Sanitizer (leak)	46s
TestPoll	30s
Check (x86_64-unknown-dragonfly)	30s
Test (macos-latest)	59s
Sanitizer (memory)	1m 49s
Check (x86_64-unknown-openbsd)	31s
Test (windows-latest)	4m 2s
Sanitizer (thread)	52s
TestWakerPipe	54s
Passed	1s
	22m 0s

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