Add fairness to futures_util::{select, try_select, select_ok} #2236

Job	Run time
cargo bench	1m 16s
cargo clippy	48s
cargo +stable build	1m 1s
cargo +beta build	1m 28s
cargo +nightly build	1m 5s
codegen	31s
cargo +1.36 build (futures-{core, io, sink})	2m 45s
cargo doc	28s
cargo hack check --feature-powerset	3m 44s
cargo fmt	6s
cargo minimal-versions build	41s
cargo miri test	13m 10s
cargo build --target thumbv7m-none-eabi	53s
cargo build --target thumbv6m-none-eabi	41s
cargo test -Z sanitizer=address	4m 48s
cargo test -Z sanitizer=memory	3m 56s
cargo test -Z sanitizer=thread	3m 1s
cargo test (ubuntu-latest)	4m 49s
cargo test (macos-latest)	6m 49s
cargo test (windows-latest)	8m 7s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	4m 27s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	10m 34s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	9m 34s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	5m 49s
cargo +1.56 build	2m 2s
	1h 32m 33s

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