Android 12.0.0 release 19
Generate apex_available from c2a instead of a patch am: 6a34237310 am: cda0442d52 am: a87de93277

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-sink/+/1688689

Change-Id: I197b0e07122a6e8799e7add41ea54f8cfe8a941c