Generate apex_available from c2a instead of a patch am: 1a7271af62 am: 2985289ffb am: f4a1f02f91

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pin-project/+/1688682

Change-Id: Id9451b9bb98660308d1366c2a8aa76c25fb6a995