GNU netcat in make tests

[Christian Hesse]

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?
-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Chris           get my mail address:    */=0;b=c[a++];)
putchar(b-1/(/*               gcc -o sig sig.c && ./sig    */b/42*2-3)*42);}
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