Fix Linux 32-bit compilation after sysroot switch.

webrtc/webrtc_examples.gyp

 # Copyright (c) 2012 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.
 {
   'includes': [
     '../talk/build/common.gypi',
@@ skipping 120 matching lines @@
                 'libraries': [
                   '<!@(pkg-config --libs-only-l glib-2.0 gobject-2.0'
                       ' gthread-2.0 gtk+-2.0)',
                   '-lX11',
                   '-lXcomposite',
                   '-lXext',
                   '-lXrender',
                 ],
               },
             }],  # OS=="linux"
+            ['OS=="linux" and target_arch=="ia32"', {
+              'cflags': [
+                '-Wno-sentinel',
+              ],
+            }],  # OS=="linux" and target_arch=="ia32"
           ],  # conditions
         },  # target peerconnection_client
       ], # targets
     }],  # OS=="linux" or OS=="win"
 
     ['OS=="ios" or (OS=="mac" and target_arch!="ia32")', {
       'targets': [
         {
           'target_name': 'apprtc_common',
           'type': 'static_library',
@@ skipping 285 matching lines @@
             'apk_name': 'AppRTCDemoTest',
             'java_in_dir': 'examples/androidtests',
             'is_test_apk': 1,
           },
           'includes': [ '../build/java_apk.gypi' ],
         },
       ],  # targets
     }],  # OS=="android"
   ],
 }