[v3] Fix second half of libstdc++/6745

[Paolo Carlini]

Hi,

the below, tested x86-linux, approved by Benjamin, fixes the
interactive part of the PR.

Ciao, Paolo.

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2002-11-18  Paolo Carlini  <pcarlini@unitus.it>

        PR libstdc++/6745 (continued)
        * include/bits/streambuf.tcc (__copy_streambufs):
        Deal with interactive input by using isatty as in the
        fix for libstdc++/8399.
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