Migrate to cargo_embargo. am: 5cffce16b3

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/openssl-macros/+/2824491

Change-Id: Ibd779dc1c5cdb2d3132cc4c9f05eb351e3e40790
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>