Function wasmtime_c_api::wasmtime_externref_clone

#[no_mangle]
pub unsafe extern "C" fn wasmtime_externref_clone(
    cx: WasmtimeStoreContextMut<'_>,
    externref: Option<&wasmtime_externref_t>,
    out: &mut MaybeUninit<wasmtime_externref_t>
)