Add Solaris operating system support #327

Job	Run time
Docs	10s
Check (armv7-sony-vita-newlibeabihf)	43s
CheckTargets	1m 49s
Check (sparcv9-sun-solaris)	27s
Clippy	10s
Check (x86_64-pc-solaris)	39s
MinimalVersions (ubuntu-latest)	22s
MSRV (ubuntu-latest)	3m 17s
MinimalVersions (macos-latest)	58s
Nightly	21s
MinimalVersions (windows-latest)	1m 13s
MSRV (windows-latest)	7m 12s
Rustfmt	6s
TestPoll	56s
Test (ubuntu-latest)	1m 43s
TestWakerPipe	1m 1s
Test (macos-latest)	1m 34s
Sanitizer (address)	1m 4s
Sanitizer (leak)	47s
Sanitizer (memory)	1m 40s
Test (windows-latest)	2m 51s
Sanitizer (thread)	58s
Passed	0s
	30m 1s

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