Do not pass SS_ISCONNECTED to sonewconn() in syncache_socket() as this
creates a race between setting up the socket and making it available on
the completed connection queue to soaccept().  This fix appears in the
FreeBSD svn repo at r261242, but I disagree with the second part of that
patch, which is to call soisconnected() later in syncache_socket().  This
is not necessary, as the ACK that caused syncache_socket() to be called
in the first place will be processed after its return, resulting in the
call to soisconnected().