pod_char_traits.h: Avoid warnings in C++0x mode when int_type is unsigned.

2011-10-05  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/ext/pod_char_traits.h: Avoid warnings in C++0x mode
	when int_type is unsigned.

From-SVN: r179587

libstdc++-v3/ChangeLog

+2011-10-05  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* include/ext/pod_char_traits.h: Avoid warnings in C++0x mode
+	when int_type is unsigned.
+
 2011-10-04  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR libstdc++/49561

libstdc++-v3/include/ext/pod_char_traits.h

 // POD character, std::char_traits specialization -*- C++ -*-
 
-// Copyright (C) 2002, 2003, 2004, 2005, 2007, 2009 Free Software Foundation, Inc.
+// Copyright (C) 2002, 2003, 2004, 2005, 2007, 2009, 2010, 2011
+// Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
 // software; you can redistribute it and/or modify it under the
@@ -32,6 +33,8 @@
 #ifndef _POD_CHAR_TRAITS_H
 #define _POD_CHAR_TRAITS_H 1
 
+#pragma GCC system_header
+
 #include <string>
 
 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)