Generate apex_available from c2a instead of a patch am: 2803aa42ec am: 46819d0a84 am: d3453b55c1 am: fda5a37ad6

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/num-traits/+/1688681

Change-Id: I20139854427af2a5d2707a7a2d01834b12bc0695