Don't check for tr1/type_traits in configure if type_traits was found.
This is just an optimization: don't waste time checking for tr1 header if we already found the standard one that we're going to use if it's available. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74882 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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