Generate apex_available from c2a instead of a patch am: 9e820487be am: 3138d28955 am: d0d7463c51

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/ryu/+/1689359

Change-Id: I414e6a3488d42e5a7cd9ad14bb01fb67f60bfaa4