Add fairness to futures_util::{select, try_select, select_ok} #2227

Job	Run time
cargo bench	1m 34s
cargo clippy	44s
codegen	38s
cargo +stable build	1m 11s
cargo +beta build	1m 7s
cargo +nightly build	1m 4s
cargo +1.36 build (futures-{core, io, sink})	1m 40s
cargo hack check --feature-powerset	16s
cargo fmt	6s
cargo minimal-versions build	36s
cargo doc	26s
cargo miri test	10m 58s
cargo test -Z sanitizer=address	5m 29s
cargo test -Z sanitizer=memory	4m 7s
cargo test -Z sanitizer=thread	3m 33s
cargo build --target thumbv7m-none-eabi	24s
cargo build --target thumbv6m-none-eabi	20s
cargo test (ubuntu-latest)	5m 26s
cargo test (macos-latest)	8m 48s
cargo test (windows-latest)	6m 11s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	4m 32s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	8m 26s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	9m 26s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	4m 39s
cargo +1.56 build	1m 46s
	1h 23m 27s

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