Boost versions

[Li-Wen Hsu]

Good news, I was talking with fluffy about the office@'s
maintainership of boost ports and realized that he has been working on
it for a while and now we have a public repository for calling for
tests:

https://github.com/fluffykhv/freebsd-ports-boost

Please help test and we might need to form another group to maintain
boost and its compatibility with other ports, please let us know if
you're interested.

Nest,
Li-Wen