Segfault in _Unwind_* code called from pthread_exit

[Gerald Pfeifer]

On Sun, 5 Nov 2017, Andreas Tobler wrote:
> Pushed on all active branches, 8/7/6.

Saw that, thank you.  Very well done, Andreas!

I should have gcc8-devel updated in the next 24 hours, gcc7-devel 
and gcc6-devel over the week as new snapshots are released.

> If you could do the gcc* branches, yes please.

Once the respective -devel ports are updated, I'll take care of 
the corresponding stable ports.

> I got one request to have the patch also in gcc5

Let's see.  First I want to address the five newer ports, then
possibly this one (though gcc5 is hardly used).

Gerald