libstdc++: Enable __gnu_test::test_container constructor for C++98

The only reason this constructor wasn't defined for C++98 is that it
uses constructor delegation, but that isn't necessary.

libstdc++-v3/ChangeLog:

	* testsuite/util/testsuite_iterators.h (test_container): Define
	array constructor for C++98 as well.

libstdc++-v3/testsuite/util/testsuite_iterators.h

@@ -610,12 +610,10 @@ namespace __gnu_test
     test_container(T* _first, T* _last) : bounds(_first, _last)
     { }
 
-#if __cplusplus >= 201103L
     template<std::size_t N>
       explicit
-      test_container(T (&arr)[N]) : test_container(arr, arr+N)
+      test_container(T (&arr)[N]) : bounds(arr, arr+N)
       { }
-#endif
 
     ItType<T>
     it(int pos)