How to build Nginx with MPTCP extension?

1. Fetch nginx and nginx-mptcp module (added to this repository as submodule): git submodule update --init
2. Run build-nginx-mptcp.sh
3. Copy nginx-mptcp.service to /etc/systemd/system/nginx-mptcp.service
4. Configure nginx-mptcp
5. Stop and disable nginx if it is running

6. Start nginx-mptcp

   systemctl daemon-reload systemctl enable nginx-mptcp systemctl start nginx-mptcp