Add OUT_DIR to rust_bindgen for boringssl am: 966c7d9e32 am: ac0785188c Original change: https://android-review.googlesource.com/c/trusty/lib/+/3323096 Change-Id: I16466551c543bb88b04456729be7250bb97d0c7e Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>