[NaCL SDK] Ship sys/mount.h for newlib/pnacl.

native_client_sdk/src/examples/tutorial/dlopen/dlopen.cc

 // 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.
 
 #include <dlfcn.h>
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/mount.h>
 
 #include <ppapi/cpp/completion_callback.h>
 #include <ppapi/cpp/instance.h>
 #include <ppapi/cpp/module.h>
 #include <ppapi/cpp/var.h>
 
 #include "eightball.h"
 #include "nacl_io/nacl_io.h"
 #include "reverse.h"
 
@@ skipping 164 matching lines @@
 
   // Create and return a DlOpenInstance object.
   virtual pp::Instance* CreateInstance(PP_Instance instance) {
     return new DlOpenInstance(instance);
   }
 };
 
 namespace pp {
 Module* CreateModule() { return new DlOpenModule(); }
 }  // namespace pp