Add fairness to futures_util::{select, try_select, select_ok} #2234

Job	Run time
cargo +1.36 build (futures-{core, io, sink})	2m 22s
cargo +1.56 build	2m 3s
cargo +stable build	1m 26s
cargo +beta build	1m 8s
cargo +nightly build	1m 3s
cargo test (ubuntu-latest)	4m 22s
cargo test (macos-latest)	4m 31s
cargo test (windows-latest)	4m 30s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	4m 37s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	4m 31s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	4m 38s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	4m 27s
cargo bench	1m 12s
cargo clippy	45s
codegen	38s
cargo doc	28s
cargo hack check --feature-powerset	4m 27s
cargo fmt	8s
cargo minimal-versions build	35s
cargo miri test	4m 33s
cargo build --target thumbv7m-none-eabi	51s
cargo build --target thumbv6m-none-eabi	43s
cargo test -Z sanitizer=address	4m 34s
cargo test -Z sanitizer=memory	3m 34s
cargo test -Z sanitizer=thread	3m 4s
	1h 5m 10s

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