Ka Ho Ng

A tracking PR in this repository and for the convenience of freebsd-ports: https://github.com/zerotier/ZeroTierOne/pull/1539.

The FreeBSD version of this is not linked with PortMapper. I need to figure out that first before moving on with this issue/PR.

Since D24066 has been committed to src, we probably would like to make this changes on upstream as well.