Add fairness to futures_util::{select, try_select, select_ok} #2627

Job	Run time
cargo test (ubuntu-latest)	3m 2s
cargo test (macos-latest)	6m 52s
cargo bench	48s
cargo test (windows-latest)	4m 49s
cargo +stable build	33s
cargo +1.36 build (futures-{core, io, sink})	44s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 15s
cargo +beta build	43s
cargo +nightly build	42s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	6m 40s
cargo hack check --feature-powerset	2m 25s
cargo minimal-versions build	25s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 39s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 32s
cargo miri test	9m 58s
cargo build --target thumbv7m-none-eabi	29s
cargo +1.56 build	1m 15s
cargo clippy	22s
cargo build --target thumbv6m-none-eabi	28s
cargo doc	18s
cargo fmt	3s
cargo test -Z sanitizer=address	3m 47s
cargo test -Z sanitizer=memory	3m 50s
cargo test -Z sanitizer=thread	2m 45s
	1h 4m 24s

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