Update bindgen to make builds (even!) lighter

[prokopyl]

This pulls in the latest update of bindgen, which contains some work I did in harryfei/which-rs#14 and rust-lang/rust-bindgen#1625 to further reduce the amount of indirect dependencies we have, and thus build times as well. 🙂

Basically, bindgen depends on the which crate, which had a mandatory dependency on failure which bindgen did not use at all. I removed the dependency in those two PRs, making all bindgen users free of having to pull failure as well as its own dependencies (most problematic being backtrace).

For us, this removes another 10 seconds of build times on my machine (from 1m28s to 1m18s). 🙂

This PR also updates the syn and quote crates to their 1.0 version, as I noticed bindgen depended on them as well, and we ended up having two different versions in the dependency tree.

[JOOpdenhoevel]

It's only a change from 53s to 47s on my machine, but a good change nonetheless!