Remove i686-hosted Linux build and start switching to new directory layout

buildbot/buildbot_pnacl_toolchain.py

 #!/usr/bin/python
 # Copyright (c) 2013 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import argparse
 import logging
 import os
 import platform
 import subprocess
@@ skipping 47 matching lines @@
     '%s_%s' % (host_os, pynacl.platform.GetArch()),
     'pnacl_newlib')
 
 def ToolchainBuildCmd(python_executable=None, sync=False, extra_flags=[]):
   executable = [python_executable] if python_executable else [sys.executable]
   sync_flag = ['--sync'] if sync else []
 
   # The path to the script is a relative path with forward slashes so it is
   # interpreted properly when it uses __file__ inside cygwin
   executable_args = ['toolchain_build/toolchain_build_pnacl.py',
-                     '--verbose', '--clobber', '--build-64bit-host',
+                     '--verbose', '--clobber',
                      '--install', toolchain_install_dir]
 
   if args.buildbot:
     executable_args.append('--buildbot')
   elif args.trybot:
     executable_args.append('--trybot')
 
   # Enabling LLVM assertions have a higher cost on Windows, particularly in the
   # presence of threads. So disable them on windows but leave them on elsewhere
   # to get the extra error checking.
@@ skipping 146 matching lines @@
   if args.buildbot:
     trybot_mode = 'false'
   else:
     trybot_mode = 'true'
 
   platform_arg = 'mode-buildbot-tc-' + arch + '-linux'
 
   command = [bash, buildbot_shell, platform_arg,  trybot_mode]
   logging.info('Running: ' + ' '.join(command))
   subprocess.check_call(command)