Add a changelog entry.

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+Removed: The Threads::DummyMutex, Threads::DummyConditionVariable, and
+Threads::DummyThreadBarrier classes have been removed. These were only
+used if deal.II was compiled without thread support, in which case
+certain functionality from the TBB was not available. But the
+implementations of the underlying functionality is now unconditionally
+available via the C++11 standard library, and so we don't need the
+dummy implementations any more.
+<br>
+(Wolfgang Bangerth, 2018/09/27)