c61722f83f
Now that clippy is installable via rustup and is generally more stable, we no longer need special scripts. `rustup component add clippy-preview` is sufficient to install clippy, and `cargo clippy` is sufficient to run it. Also, don't run clippy in test-all.sh. We do generally want to fix things clippy reports, however it's not a requirement that the code be kept clippy-warning-free at all times.