os_defines.h: Do not define anymore _GLIBCXX_HAVE_BROKEN_VSWPRINTF.

2012-10-31  Jonathan Yong  <jon_y@users.sourceforge.net>

	* config/os/mingw32-w64/os_defines.h: Do not define anymore
	_GLIBCXX_HAVE_BROKEN_VSWPRINTF.

From-SVN: r193033

libstdc++-v3/config/os/mingw32-w64/os_defines.h

 // Specific definitions for generic platforms  -*- C++ -*-
 
-// Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
-// 2009, 2010, 2011  Free Software Foundation, Inc.
+// Copyright (C) 2000-2012  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
@@ -63,10 +62,6 @@
 // See libstdc++/20806.
 #define _GLIBCXX_HAVE_DOS_BASED_FILESYSTEM 1
 
-// See  libstdc++/37522. mingw-w64 stdio redirect for C++
-// #define _GLIBCXX_HAVE_BROKEN_VSWPRINTF 1
-// Workaround added for mingw-w64 trunk headers r5437
-
 // See libstdc++/43738
 // On native windows targets there is no ioctl function. And the existing
 // ioctlsocket function doesn't work for normal file-descriptors.