Generate apex_available from c2a instead of a patch am: 9e820487be am: 3138d28955 am: d0d7463c51 am: b3008f9912

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

Change-Id: I07b7eb49dbbd4aeb6e00763142525e1d7da6b72a