Raw `bindgen` FFI bindings over the X-Plane plugin SDK's `SDK/CHeaders`. No
safety, no ergonomics — see [`flybywireless-xplm`](https://crates.io/crates/flybywireless-xplm)
for the safe wrapper built on top of this crate.
Published on crates.io as `flybywireless-xplm-sys`. See the
[workspace README](https://github.com/FlyByWireless/XPLM) for SDK setup and
supported `XPLM<version>` feature flags.