[NaCl SDK] nacl_io: Rename termios entry points.

native_client_sdk/src/libraries/nacl_io/syscalls/termios/tcdrain.c

 /* Copyright 2013 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 #include <sys/types.h>
 /*
  * Include something that will define __BIONIC__, then wrap the entire file
  * in this #if, so this file will be compiled on a non-bionic build.
  */
 
 #if !defined(__BIONIC__)
 
 #include <errno.h>
 
 #include "nacl_io/kernel_intercept.h"
 #include "nacl_io/kernel_wrap.h"
 
 int tcdrain(int fd) {
   errno = ENOSYS;
   return -1;
 }
 
 #endif /* #if !defined(__BIONIC_) */