Generate apex_available from c2a instead of a patch am: e432fd933d am: d43d2d3679 am: 699554b476 am: 018221862b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/unicode-normalization/+/1689363

Change-Id: I02a54908e7f650bac40b4b33020f2c367f85309c