util: drop unix_nonblocking_connect()

It is never used; all nonblocking connect now goes through
socket_connect(), which calls unix_connect_addr().

Cc: Daniel P. Berrange <berrange@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Message-Id: <1469097213-26441-3-git-send-email-caoj.fnst@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/qemu/sockets.h

@@ -41,9 +41,6 @@ NetworkAddressFamily inet_netfamily(int family);
 
 int unix_listen(const char *path, char *ostr, int olen, Error **errp);
 int unix_connect(const char *path, Error **errp);
-int unix_nonblocking_connect(const char *str,
-                             NonBlockingConnectHandler *callback,
-                             void *opaque, Error **errp);
 
 SocketAddress *socket_parse(const char *str, Error **errp);
 int socket_connect(SocketAddress *addr, Error **errp,