[patch] replace reinterpret_cast with static_cast in tests

[Jonathan Wakely]

No need to use reinterpret_cast in these tests, static_cast is enough.
 The copies of these tests under 20_util already use static_cast.

Texted x86-64/linux - OK for mainline?

        * testsuite/tr1/2_general_utilities/shared_ptr/thread/
        default_weaktoshared.cc: Use static_cast not reinterpret_cast.
        * testsuite/tr1/2_general_utilities/shared_ptr/thread/
        mutex_weaktoshared.cc: Likewise.
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