Update version of Go to 1.5

mojo/go/go.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """
 This script invokes the go build tool.
 Must be called as follows:
 python go.py [--android] <go-tool> <build directory> <output file>
 <src directory> <CGO_CFLAGS> <CGO_LDFLAGS> <go-binary options>
@@ skipping 60 matching lines @@
       ndk_path = os.path.join(src_root, 'third_party', 'android_tools', 'ndk')
       if sys.platform.startswith('linux'):
         arch = 'linux-x86_64'
       elif sys.platform == 'darwin':
         arch = 'darwin-x86_64'
       else:
         raise Exception('unsupported platform: ' + sys.platform)
       ndk_cc = os.path.join(ndk_path, 'toolchains', NDK_TOOLCHAIN,
           'prebuilt', arch, 'bin', 'arm-linux-androideabi-gcc')
       sysroot = os.path.join(ndk_path, 'platforms', NDK_PLATFORM, 'arch-arm')
+      env['CGO_CFLAGS'] += ' --sysroot %s' % sysroot
+      env['CGO_LDFLAGS'] += ' --sysroot %s' % sysroot
       env['CC'] = '%s --sysroot %s' % (ndk_cc, sysroot)
 
   call_result = subprocess.call([go_tool] + go_options, env=env)
   if call_result != 0:
     return call_result
   out_files = sorted([ f for f in os.listdir('.') if os.path.isfile(f)])
   if (len(out_files) > 0):
     shutil.move(out_files[0], out_file)
   os.chdir(old_directory)
   try:
     shutil.rmtree(build_dir, True)
   except Exception:
     pass
 
 if __name__ == '__main__':
   sys.exit(main())