Macro assert_compatible_version

macro_rules! assert_compatible_version {
    ($v:expr $(,)?) => { ... };
}

Reexport items from other uniffi creates Assert that the uniffi runtime version matches an expected value.

This is a helper hook for the generated Rust scaffolding, to produce a compile-time error if the version of uniffi_bindgen used to generate the scaffolding was incompatible with the version of uniffi being used at runtime.