[macports-ports] branch master updated: gnutls 3.5.15: add doc variant

[Ken Cunningham]

> But similar to cxx11 1.0, it doesn't do much on systems using libc++, i.e. 10.9 or later.
> 

The only thing it does if libc++ is selected is blacklist  { clang > 500 } and *gcc*

Ken