Add fairness to futures_util::{select, try_select, select_ok} #2228

Job	Run time
cargo test (ubuntu-latest)	4m 23s
cargo test (macos-latest)	8m 15s
cargo test (windows-latest)	8m 37s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	4m 17s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	8m 18s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	9m 38s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	4m 45s
cargo bench	1m 59s
codegen	31s
cargo +stable build	1m 11s
cargo +beta build	1m 31s
cargo +nightly build	1m 7s
cargo +1.36 build (futures-{core, io, sink})	2m 3s
cargo hack check --feature-powerset	5m 2s
cargo minimal-versions build	48s
cargo build --target thumbv7m-none-eabi	45s
cargo build --target thumbv6m-none-eabi	45s
cargo +1.56 build	1m 38s
cargo clippy	43s
cargo doc	27s
cargo fmt	7s
cargo miri test	10m 11s
cargo test -Z sanitizer=address	5m 9s
cargo test -Z sanitizer=memory	3m 12s
cargo test -Z sanitizer=thread	2m 56s
	1h 28m 18s

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