protobuf3-cpp now requires -std=c++11

[Ken Cunningham]

It appears this latest update to protobuf3-cpp now requires c++11 enabled to build anything.

AFAICT, every port that uses protobuf3-cpp (ostinato, libphonenumber-cpp, mosh, etc, etc, etc) will all have to be reworked to kick them into c++11 builds.

This requires more than just:

PortGroup cxx11 1.1

as you have to get -std=c++11 onto every cpp build line in whatever way works.

Best,

Ken