Migrate to cargo_embargo. am: 2b205855d7 am: 7c7ece992b am: dee74998f0

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/unsafe-libyaml/+/2832813

Change-Id: I421249240bec29e6a0904af4d710970c52edf278
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>