syscall: handle getsockname for unix sockets on openbsd 5.2
On OpenBSD 5.2, calling getsockname on an unbound Unix domain socket results in a successful syscall, however the AF is unset and the length is returned as zero. This has been changed to more portable behaviour, which will be included in the OpenBSD 5.3 release. For now, work around this by treating a successful getsockname() call that returns a family of AF_UNSPEC and length of zero as a AF_UNIX socket. Makes TestPassFD work on OpenBSD 5.2. Fixes #4956. R=golang-dev, minux.ma, rsc, mikioh.mikioh CC=golang-dev https://golang.org/cl/7449046
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