rust: Upgrade 1.66.1 -> 1.67.0

Disable ZStd to avoid needing libzstd in llvm (mirrors zlib disable).
Generate complete list of rust-snapshot artefacts from src/stage0.json.
Drop clippy-driver reproducibility change as the code is gone from
upstream.

Release notes:
  https://releases.rs/docs/1.67.0/



License-Update: Unicode-TOU text added (already in our license string)
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>