Move build scripts to webrtc/build/ios

webrtc/build/ios/export_headers

 #!/usr/bin/python
 
 #  Copyright 2016 The WebRTC project authors. All Rights Reserved.
 #
 #  Use of this source code is governed by a BSD-style license
 #  that can be found in the LICENSE file in the root of the source
 #  tree. An additional intellectual property rights grant can be found
 #  in the file PATENTS.  All contributing project authors may
 #  be found in the AUTHORS file in the root of the source tree.
 
@@ skipping 23 matching lines @@
   within the include directory.
 
   Args:
     include_base_dir: directory where the include directory should be created
   """
 
   include_dir_name = 'include'
   include_path = os.path.join(include_base_dir, include_dir_name)
 
   script_path = sys.path[0]
-  webrtc_base_path = os.path.join(script_path, '../..')
+  webrtc_base_path = os.path.join(script_path, '../../..')
 
   header_dirs = HEADER_DIRS
   include_headers = HEADER_INCLUDES
   exclude_headers = HEADER_EXCLUDES
   if use_legacy_headers:
     header_dirs = LEGACY_HEADER_DIRS
     include_headers = LEGACY_HEADER_INCLUDES
     exclude_headers = LEGACY_HEADER_EXCLUDES
 
   for directory in header_dirs:
@@ skipping 22 matching lines @@
   parser = optparse.OptionParser()
   _, args = parser.parse_args()
   if len(args) != 2:
     parser.error('Error: Exactly 2 arguments required.')
   include_base_dir = args[0]
   use_legacy_headers = False if int(args[1]) == 0 else True
   ExportHeaders(include_base_dir, use_legacy_headers)
 
 if __name__ == '__main__':
   sys.exit(Main())