WIP: lang/php71

[Torsten Zuehlsdorff]

Aloha,

PHP 7.1 RC5 was released and it will hopefully not too far until the 
full release. Therefore i started some work on the new port.

Sadly i haven't had much time in the last, so its not too much. 
Currently i just added lang/php71, pet portlint a little and test a 
little of the basics.

Of course all 60+ extensions are missing, but i centered my affords at 
the core. It should be relatively easy to add them.

If you want to test or participate you can use my ports-tree copy from 
GitLab:

$ git clone https://github.com/t-zuehlsdorff/freebsd-ports
$ git checkout php71

Feel free to add what you want and do a pull request!

Greetings,
Torsten