Fix gyp_v8 to work with use_system_icu=1

build/gyp_v8

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 29 matching lines @@
 v8_root = os.path.normpath(os.path.join(script_dir, os.pardir))
 
 if __name__ == '__main__':
   os.chdir(v8_root)
   script_dir = os.path.dirname(__file__)
   v8_root = '.'
 
 sys.path.insert(0, os.path.join(v8_root, 'build', 'gyp', 'pylib'))
 import gyp
 
+# Add paths so that pymod_do_main(...) can import files.
+sys.path.insert(
+    1, os.path.abspath(os.path.join(v8_root, 'tools', 'generate_shim_headers')))
+
 
 def apply_gyp_environment(file_path=None):
   """
   Reads in a *.gyp_env file and applies the valid keys to os.environ.
   """
   if not file_path or not os.path.exists(file_path):
     return
   file_contents = open(file_path).read()
   try:
     file_data = eval(file_contents, {'__builtins__': None}, None)
@@ skipping 98 matching lines @@
     args.append('--check')
 
   print 'Updating projects from gyp files...'
   sys.stdout.flush()
 
   # Generate for the architectures supported on the given platform.
   gyp_args = list(args)
   if platform.system() == 'Linux':
     gyp_args.append('--generator-output=out')
   run_gyp(gyp_args)