openssh: fix X11 Forwarding support (from MacPorts)

This will fix the problem of being unable to use X11 forwarding causing the following error:

        /private/tmp/com.apple.launchd.sI1o0yhO1s/org.macosforge.xquartz: unknown host. (nodename nor servname provided, or not known)

* Patch added:  https://trac.macports.org/export/127257/trunk/dports/net/openssh/files/launchd.patch
* See http://xquartz.macosforge.org/trac/ticket/1451 for the details