[PATH 1/3] libstdc++: Simplify std::copy istreambuf_iterator overload

[François Dumont]

libstdc++: Use only public basic_streambuf methods in __copy_move_a2 
overload

__copy_move_a2 for istreambuf_iterator can be implemented using public
basic_streambuf in_avail and sgetn so that __copy_move_a2 do not need to be
basic_streambuf friend.

libstdc++-v3/ChangeLog:

         * include/std/streambuf (__copy_move_a2): Remove friend 
declaration.
         * include/bits/streambuf_iterator.h (__copy_move_a2): 
Re-implement using
         streambuf in_avail and sgetn.

Tested under Linux x86_64.

Ok to commit ?

François

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