message: Implement missing C API function `wasm_func_copy`
diff: @@ -181,6 +181,11 @@ pub unsafe extern "C" fn wasm_func_new_with_env(
  Some(Box::new(wasm_func_t::new(function)))
  }
  +#[no_mangle]
  +pub extern "C" fn wasm_func_copy(func: &wasm_func_t) -> Box<wasm_func_t> {
  + Box::new(func.clone())
  +}
  +
  #[no_mangle]
  pub unsafe extern "C" fn wasm_func_delete(_func: Option<Box<wasm_func_t>>) {}
  