The next breaking `ndk` release puts a lot of emphasis in improving
`enum`s to finally be marked `non_exhaustive`, and carry possible future
values in `__Unknown(i32)` variants. This removes the lossy conversions
that previously required `android-activity` to redefine its types, which
could all be removed again.
The `repr()` types have also been updated, as `enum` constants in C are
translated to `u32` by default in `bindgen` even though they're commonly
passed as `int` to every API function that consumes them.
Marijn Suijten