Linux: add support for SELinux.

build/linux/system.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables' : {
     'includes': [
       '../common.gypi',
     ],
     'conditions': [
@@ skipping 117 matching lines @@
       },
       'link_settings': {
         'ldflags': [
           '<!@(<(pkg-config) --libs-only-L --libs-only-other x11)',
         ],
         'libraries': [
           '<!@(<(pkg-config) --libs-only-l x11)',
         ],
       },
     },
+    {
+      'target_name': 'selinux',
+      'type': 'settings',
+      'link_settings': {
+        'libraries': [
+          '-lselinux',
+        ],
+      },
+    },
 # TODO(evanm): temporarily disabled while we figure out whether to depend
 # on gnome-keyring etc.
 # http://code.google.com/p/chromium/issues/detail?id=12351
 #     {
 #       'target_name': 'gnome-keyring',
 #       'type': 'settings',
 #       'direct_dependent_settings': {
 #         'cflags': [
 #           '<!@(<(pkg-config) --cflags gnome-keyring-1)',
 #         ],
@@ skipping 19 matching lines @@
 #         'ldflags': [
 #           '<!@(<(pkg-config) --libs-only-L --libs-only-other dbus-glib-1)',
 #         ],
 #         'libraries': [
 #           '<!@(<(pkg-config) --libs-only-l dbus-glib-1)',
 #         ],
 #       },
 #     },
   ],
 }