Merge "Generate apex_available from c2a instead of a patch" am: dbf6b615c0 am: b094af202c am: 0aa588c4ef

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-task/+/1688807

Change-Id: I67b8893876c27884f250c8e4adfe698c7f17687d