fix PR libstdc++/48398

[Jonathan Wakely]

2011-04-02  Jonathan Wakely  <redi@gcc.gnu.org>

        PR libstdc++/48398
        * include/bits/unique_ptr.h (__tuple_type): Store pointer type.
        * testsuite/20_util/unique_ptr/modifiers/48398.cc: New.
        * testsuite/20_util/unique_ptr/requirements/pointer_type.cc: Remove
        unused parameter name.

tested x86_64-linux and committed to 4.6 branch, will commit to trunk
once I've built r171842 (before the bootstrap comparison failure) and
tested.
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