Split filename-based syscall implementations into a separate file

src/shared/platform/nacl_host_desc.h

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * NaCl Service Runtime.  I/O Descriptor / Handle abstraction.  Memory
  * mapping using descriptors.
  */
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLATFORM_NACL_HOST_DESC_H__
 #define NATIVE_CLIENT_SRC_TRUSTED_PLATFORM_NACL_HOST_DESC_H__
 
+#include <sys/stat.h>
+
 #include "native_client/src/include/nacl_compiler_annotations.h"
 #include "native_client/src/include/portability.h"
 #include "native_client/src/shared/platform/nacl_sync.h"
 
 #if NACL_LINUX || NACL_OSX
 # include "native_client/src/shared/platform/posix/nacl_host_desc_types.h"
 #elif NACL_WINDOWS
 # include "native_client/src/shared/platform/win/nacl_host_desc_types.h"
 #endif
 
@@ skipping 330 matching lines @@
                                              char const **out_msg);
 
 extern DWORD NaClflProtectMap(int prot);
 #endif
 
 EXTERN_C_END
 
 #endif  /* defined __native_client__ */
 
 #endif  /* NATIVE_CLIENT_SRC_TRUSTED_PLATFORM_NACL_HOST_DESC_H__ */