[cap-primitives] add support for illumos #1712

Job	Run time
Check Cross-Compilation on Rust nightly (nightly)	2m 9s
Check Cross-Compilation on Rust nightly on Windows (nightly)	1m 57s
Check Cross-Compilation (stable)	1m 27s
Check Cross-Compilation on Windows (stable)	2m 48s
Check Cross-Compilation (beta)	1m 30s
Fuzz Targets	45s
Check Cross-Compilation on Windows (beta)	1m 42s
Rustfmt	12s
Test (stable)	38s
Test linux-raw support (ubuntu)	28s
Test on Musl (ubuntu)	57s
Test linux-raw support (ubuntu-20.04)	31s
Test (msrv)	1m 55s
Test (windows-latest)	2m 48s
Test with Rust nightly (ubuntu)	33s
Test (windows-2019)	2m 5s
Test with Rust nightly (windows)	1m 45s
Test (macos-latest)	31s
Test (macos-12)	1m 7s
Test (beta)	32s
Test (ubuntu-20.04)	32s
Test (aarch64-ubuntu)	2m 19s
	29m 11s

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