Fix warning about shadowing std::ignore

pcbnew/legacy_plugin.cpp

@@ -4,7 +4,7 @@
  *
  * Copyright (C) 2007-2012 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
  * Copyright (C) 2004 Jean-Pierre Charras, jp.charras@wanadoo.fr
- * Copyright (C) 1992-2016 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 1992-2017 KiCad Developers, see AUTHORS.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -237,7 +237,7 @@ static inline char* ReadLine( LINE_READER* rdr, const char* caller )
 
 
 
-using namespace std;    // unique_ptr
+using std::unique_ptr;
 
 
 static EDA_TEXT_HJUSTIFY_T horizJustify( const char* horizontal )