Add dlwrap.c to binutils to simulate dlopen/dlsym for gold plugin

binutils-2.20/gold/plugin.cc

 // plugin.cc -- plugin manager for gold      -*- C++ -*-
 
 // Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
 // Written by Cary Coutant <ccoutant@google.com>.
 
 // This file is part of gold.
 
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation; either version 3 of the License, or
@@ skipping 12 matching lines @@
 #include "gold.h"
 
 #include <cstdio>
 #include <cstdarg>
 #include <cstring>
 #include <string>
 #include <vector>
 #include <set> // @LOCALMOD
 
 #ifdef ENABLE_PLUGINS
-#include <dlfcn.h>
+#include <dlwrap.h>   // @LOCALMOD
 #endif
 
 #include "parameters.h"
 #include "errors.h"
 #include "fileread.h"
 #include "layout.h"
 #include "options.h"
 #include "plugin.h"
 #include "target.h"
 #include "readsyms.h"
@@ skipping 1597 matching lines @@
                      "64-bit little-endian object"),
                    input_file->filename().c_str());
 #endif
     }
 
   gold_assert(obj != NULL);
   return obj;
 }
 
 } // End namespace gold.