Fixed MinGW/configure/Unicode compilation: MinGW/MSVCRT vswprintf does not
behave like other vswprintf; under Win32 you really want _vsnwprintf. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@17163 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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