Android 12.0.0 release 19
Generate apex_available from c2a instead of a patch am: 798c708a18 am: 0a01c5a1c8 am: eaaa0489c9

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/idna/+/1688778

Change-Id: Id951e4f9b314a783c81d6bf83ac0961ac4bd39e9