Low-level bindings to the vertical synchronization API on OpenHarmony.
A higher level binding is provided by the [ohos-vsync](https://docs.rs/ohos-vsync/) crate.
C API reference: https://gitcode.com/openharmony/docs/blob/master/en/application-dev/reference/apis-arkgraphics2d/capi-nativevsync.md
Licensed under the Apache-2.0 license, matching the license of OpenHarmony.