Add os constants #14130

Job	Run time
Check Rust code with rustfmt and clippy	17s
Run snippets and cpython tests (ubuntu-latest)	16m 49s
Run snippets and cpython tests (macos-latest)	16m 51s
Run rust tests (windows-latest)	13m 2s
Run snippets and cpython tests (windows-latest)	26m 40s
Run rust tests (macos-latest)	4m 59s
Run rust tests (ubuntu-latest)	12m 21s
Ensure compilation on various targets	11m 45s
Check the WASM package and demo	4m 58s
Run tests under miri	3m 7s
Run snippets and cpython tests on wasm-wasi	2m 47s
	1h 53m 36s

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