Generate apex_available from c2a instead of a patch am: 45bd22d6ac am: 659e5981d3 am: e2b95ed469

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/clap/+/1688623

Change-Id: I8d18f1e07c64e8b51b38a076de3c0b8b3c135dd9