CI: stop installing clippy with rustup
As of cargo 1.35 clippy is now build in to cargo it seems. https://github.com/rust-lang/cargo/pull/6759
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
As of cargo 1.35 clippy is now build in to cargo it seems. https://github.com/rust-lang/cargo/pull/6759