all: merge NaCl branch (part 1)

src/pkg/net/tcpsock_posix.go

 // Copyright 2009 The Go Authors.  All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux nacl netbsd openbsd windows
 
 package net
 
 import (
         "io"
         "os"
         "syscall"
         "time"
 )
 
@@ skipping 273 matching lines @@
         }
         if laddr == nil {
                 laddr = &TCPAddr{}
         }
         fd, err := internetSocket(net, laddr, nil, noDeadline, syscall.SOCK_STREAM, 0, "listen", sockaddrToTCP)
         if err != nil {
                 return nil, &OpError{Op: "listen", Net: net, Addr: laddr, Err: err}
         }
         return &TCPListener{fd}, nil
 }