message: [ndproxy] fix binding to interface for macOS
diff: @@ -380,7 +380,8 @@ otbrError NdProxyManager::InitIcmp6RawSocket(void)
  mBackboneInterfaceName.length()) == 0,
  error = OTBR_ERROR_ERRNO);
  #else // __NetBSD__ || __FreeBSD__ || __APPLE__
  - VerifyOrExit(setsockopt(mIcmp6RawSock, IPPROTO_IP, IP_BOUND_IF, mBackboneIfName.c_str(), mBackboneIfName.size()),
  + VerifyOrExit(
  + setsockopt(mIcmp6RawSock, IPPROTO_IPV6, IPV6_BOUND_IF, mBackboneIfName.c_str(), mBackboneIfName.size()),
  error = OTBR_ERROR_ERRNO);
  #endif // __linux__
  