Upgrade rust/crates/protobuf to 2.22.1 am: fa77f00cb5 am: 0dec0886da am: 06993f5a0b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/protobuf/+/1662805

Change-Id: Ie8fdcea04d282b1c99ff2d03cecd8dc00e750acf
tree: f4a3c759264793470fd44a7eca0c5319fea4f032
  1. benches/
  2. out/
  3. patches/
  4. src/
  5. .cargo_vcs_info.json
  6. Android.bp
  7. build.rs
  8. Cargo.toml
  9. Cargo.toml.orig
  10. LICENSE.txt
  11. METADATA
  12. MODULE_LICENSE_MIT
  13. OWNERS
  14. README.md
  15. regenerate.sh
README.md

How to develop rust-protobuf itself

cargo test --all to build everything.

If code generator is changed, code needs to be regenerated, see regenerate.sh.