Migrate to cargo_embargo. am: 5cffce16b3

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

Change-Id: I65b7b1102b2618cbe3e6be3c3bb5a1278cbbf17a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>