Function unwrap

examples/linking.cc:8–14

using namespace wasmtime;

template <typename T, typename E> T unwrap(Result<T, E> result) {
  if (result) {
    return result.ok();
  }
  std::cerr << "error: " << result.err().message() << "\n";
  std::abort();
}

std::string readFile(const char *name) {
  std::ifstream watFile;