_Rb_tree regression

[François Dumont]

Hi

     I have been reported privately by Christophe in copy a regression 
resulting from my recent changes to _Rb_tree. I removed a constructor 
still necessary in C++03 mode or before. Tests would have shown it if I 
had run them in C++03.

     * include/bits/stl_tree.h
     (_Rb_tree_impl(const _Key_compare&, const _Node_allocator&): Restore
     before C++11 mode.

     I prefer to restore it only before C++11 while it used to be 
available in any mode. It is only call with rvalue references. Don't 
hesitate to commit it yourself if you prefer to fix it quickly otherwise 
I'll do it after validation in about 24 hours.

François

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