[PATCH] Disable AF_UNIX handshake with setsockopt(..., SO_PEERCRED, ...)

[Christian Franke]

This is a workaround for this problem which blocks ITP postfix:
https://cygwin.com/ml/cygwin/2014-08/msg00420.html

With the patch, this disables the secret+cred handshakes of the AF_UNIX 
emulation:

int sd = socket(AF_UNIX, SOCK_STREAM, 0);

setsockopt(sd, SOL_SOCKET, SO_PEERCRED, NULL, 0);

Postfix works if socket() calls are replaced by the above.

Calls of getsockopt(..., SO_PEERCRED, ...) and getpeereid() would fail with ENOTSUP then. These are not used by postfix.

Christian

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