Add metadata and build files for libfuzzer-sys am: 1b0f479bcd am: 2fa1297759

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/libfuzzer-sys/+/1500711

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ie1bdfc87074ce421d7a728674ed7e7873a5a98c0