Add fairness to futures_util::{select, try_select, select_ok} #2233

Job	Run time
cargo bench	2m 32s
codegen	30s
cargo clippy	33s
cargo +stable build	1m 6s
cargo +beta build	1m 5s
cargo +nightly build	1m 17s
cargo +1.36 build (futures-{core, io, sink})	1m 42s
cargo doc	27s
cargo hack check --feature-powerset	2m 41s
cargo fmt	6s
cargo minimal-versions build	35s
cargo miri test	2m 40s
cargo build --target thumbv7m-none-eabi	43s
cargo build --target thumbv6m-none-eabi	52s
cargo test -Z sanitizer=address	2m 41s
cargo test -Z sanitizer=memory	2m 39s
cargo test -Z sanitizer=thread	2m 39s
cargo test (ubuntu-latest)	2m 41s
cargo test (macos-latest)	2m 39s
cargo test (windows-latest)	2m 30s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	2m 41s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	2m 42s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	2m 41s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	2m 40s
cargo +1.56 build	1m 57s
	45m 19s

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