GNU netcat in make tests

[Damien Miller]

On Thu, 24 Jul 2014, Christian Hesse wrote:

> Hello everybody,
> 
> regression tests do use `nc -U` since commit 0e4e955 to test for Unix domain
> socket forwarding. This fails on systems that have GNU netcat installed as
> that does not support Unix domain sockets. In fact it does not understand the
> `-U` option at all. What way to go there?

Despatch some time-travelling robot assassins to ensure that GNU
netcat was never created?

In the meantime, maybe we could avoid the use of GNU netcat althother
by using a ssh-agent's socket in the tests...

-d