[libcxx] Patch for a typo

[Howard Hinnant]

On Feb 6, 2013, at 3:02 PM, Marcin Zalewski <marcin.zalewski at gmail.com> wrote:

> __copy_backward says InputIterator, but I think it should be
> OutputIterator. Patch attached.
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Please run tests on:

test/algorithms/alg.modifying.operations/alg.copy

Howard