removal of cxx11 PG and pre-snowleopard systems having some issues

[Ken Cunningham]

> On Oct 6, 2019, at 7:28 PM, Joshua Root <jmr at macports.org> wrote:
> 

> OK, that's certainly not expected behaviour, but it's nothing to do with
> cxx11.
> 
> - Josh

Well, the ports that still have the cxx11 1.1 PG on them fall back properly to gcc-6, so from that point of view, they still work.

Of course, the PG is setting the compilers directly, so of course they would work. But that’s how it’s connected to cxx11.

Ken