Update licence generation script after GYP->GN migration.

tools-webrtc/ios/build_ios_libs.py

Index: tools-webrtc/ios/build_ios_libs.py
diff --git a/tools-webrtc/ios/build_ios_libs.py b/tools-webrtc/ios/build_ios_libs.py
index 4e2585cc8a7e05b0ee0075aa794d2194fe61af07..6e7f14a8dc8251ead2ffd580feefc65398463bd9 100755
--- a/tools-webrtc/ios/build_ios_libs.py
+++ b/tools-webrtc/ios/build_ios_libs.py
@@ -204,6 +204,15 @@ def main():
       cmd = ['lipo'] + lib_dsym_paths + ['-create', '-output', out_dsym_path]
       _RunCommand(cmd)
 
+    # Generate the license file.

[tkchin_webrtc, 2017/03/09 22:26:28]

Is this arch dependent? (Or is there a way to make sure that it is not arch
dependent?)

+    license_script_path = os.path.join(os.path.dirname(SCRIPT_DIR),
+                                       'generate_licenses.py')
+    ninja_dir = os.path.join(args.output_dir, args.arch[0] + '_libs')
+    gn_target_full_name = '//webrtc/sdk:rtc_sdk_framework_objc'
+    cmd = [sys.executable, license_script_path, gn_target_full_name, ninja_dir,
+           os.path.join(args.output_dir, SDK_FRAMEWORK_NAME)]
+    _RunCommand(cmd)
+
     # Modify the version number.
     # Format should be <Branch cut MXX>.<Hotfix #>.<Rev #>.
     # e.g. 55.0.14986 means branch cut 55, no hotfixes, and revision 14986.