Migrate to cargo_embargo. am: 4a9384f6a9

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pathdiff/+/2824493

Change-Id: I97066ac8acc6dfec922444b1070f7a8167c73d6f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>