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

native_client_sdk/src/examples/demo/flock/flock.cc

 // Copyright 2013 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 <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/mount.h>
 
 #include <algorithm>
 #include <sstream>
 #include <string>
 #include <vector>
 
-#include "nacl_io/nacl_io.h"
-
 #include "ppapi/c/pp_rect.h"
 #include "ppapi/c/pp_size.h"
 
 #include "ppapi_simple/ps_context_2d.h"
 #include "ppapi_simple/ps_main.h"
 
 #include "goose.h"
 #include "sprite.h"
 #include "vector2.h"
 
@@ skipping 115 matching lines @@
   }
 
   return 0;
 }
 
 /*
  * Register the function to call once the Instance Object is initialized.
  * see: pappi_simple/ps_main.h
  */
 PPAPI_SIMPLE_REGISTER_MAIN(example_main);