Avoid _Rb_tree_rotate_[left,right] symbols export

[François Dumont]

Hi

     When versioned namespace is active we can avoid export of 
_Rb_tree_rotate_[left,right] symbols. I also took the opportunity to put 
static functions in the anonymous namespace rather than using static. Is 
this usage of static still planned to be deprecated ?

     * src/c++98/tree.cc [_GLIBCXX_INLINE_VERSION]
     (_Rb_tree_rotate_left, _Rb_tree_rotate_right): Remove.
     * src/c++98/tree.cc (local_Rb_tree_increment, local_Rb_tree_decrement):
     Move to anonymous namespace.
     (local_Rb_tree_rotate_left, local_Rb_tree_rotate_right): Likewise.

Tested under Linux x86_64 with versioned namespace.

Ok to commit ?

François


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