Reland of move usage of deprecated g_type_init API

webrtc/examples/peerconnection/client/linux/main.cc

 /*
  *  Copyright 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.
  */
 
@@ skipping 36 matching lines @@
 
  protected:
   rtc::Thread* thread_;
   GtkMainWnd* wnd_;
   Conductor* conductor_;
   PeerConnectionClient* client_;
 };
 
 int main(int argc, char* argv[]) {
   gtk_init(&argc, &argv);
-  g_type_init();
+  // g_type_init API is deprecated (and does nothing) since glib 2.35.0, see:
+  // https://mail.gnome.org/archives/commits-list/2012-November/msg07809.html
+#if !GLIB_CHECK_VERSION(2, 35, 0)
+    g_type_init();
+#endif
   // g_thread_init API is deprecated since glib 2.31.0, see release note:
   // http://mail.gnome.org/archives/gnome-announce-list/2011-October/msg00041.html
 #if !GLIB_CHECK_VERSION(2, 31, 0)
     g_thread_init(NULL);
 #endif
 
   rtc::FlagList::SetFlagsFromCommandLine(&argc, argv, true);
   if (FLAG_help) {
     rtc::FlagList::Print(NULL, false);
     return 0;
@@ skipping 30 matching lines @@
   thread->set_socketserver(NULL);
   // TODO(henrike): Run the Gtk main loop to tear down the connection.
   /*
   while (gtk_events_pending()) {
     gtk_main_iteration();
   }
   */
   rtc::CleanupSSL();
   return 0;
 }