Ensure -D_FILE_OFFSET_BITS=64 also gets on the command line when
needed, and also fix wx-config to output the largefile flags git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16998 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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