[committed 2/2] libstdc++: Fix test that fails for C++98

[Jonathan Wakely]

Local classes have no linkage so cannot be used as template arguments in
C++98.

libstdc++-v3/ChangeLog:

         * testsuite/20_util/specialized_algorithms/uninitialized_fill_n/sizes.cc:
         Move struct to namespace scope.


Tested powerpc64le-linux, committed to trunk.
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