Linux build: Use sysroot when calculating dependencies

tools/checklicenses/checklicenses.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.
 
 """Makes sure that all files contain proper licensing information."""
 
 
 import json
 import optparse
@@ skipping 216 matching lines @@
     ],
 
     # http://crbug.com/333508
     'buildtools/clang_format/script': [
         'UNKNOWN',
     ],
 
     'third_party/devscripts': [
         'GPL (v2 or later)',
     ],
+    'third_party/dpkg-dev': [

[Lei Zhang, 2016/10/17 23:28:30]

I'm lgtm-ing this separately.

No need to stop the CQ, but it would be nice to add a bug number here so readers
can easily understand why this is here, and so you'll remember to remove it in
the near future.

[Tom (Use chromium acct), 2016/10/18 19:25:14]

Done.

+        'GPL (v2 or later)',
+    ],
     'third_party/catapult/firefighter/default/tracing/third_party/devscripts': [

[Lei Zhang, 2016/10/17 23:28:30]

Also, the 3 devscripts entries are grouped together. It would've been nice to
put it in a separate block.

[Tom (Use chromium acct), 2016/10/18 19:25:14]

Done.

         'GPL (v2 or later)',
     ],
     'third_party/catapult/tracing/third_party/devscripts': [
         'GPL (v2 or later)',
     ],
 
     # https://github.com/shazow/apiclient/issues/8
     # MIT license.
     'third_party/catapult/third_party/apiclient': [
         'UNKNOWN',
@@ skipping 531 matching lines @@
                            action='store_true',
                            default=False,
                            help='Ignore path-specific license whitelist.')
   option_parser.add_option('--json', help='Path to JSON output file')
   options, args = option_parser.parse_args()
   return check_licenses(options, args)
 
 
 if '__main__' == __name__:
   sys.exit(main())