bug#6781: emacs server with X11 build on OSX

[Stefan Monnier]

> -                        (list :family nil
> +                        (list :family 'ipv4

That would make sense if emacsclient.c only supports ipv4.  Not being
up-to-speed on ipv6, I do not know whether that's the case.

> -                              :host (or server-host 'local)
> +                              :host (or server-host "127.0.0.1") ;; bug#6781

We should rather do that in the C code of make-network-process, where
instead of "localhost" we might prefer using "127.0.0.1".


        Stefan