NUMA for 9 threads or more

Enable numa machinery only for STRICTLY MORE than 8 threads. Reason for this
change is that nowadays SMP tests are always done with 8 threads. That is a
problem for multi-socket Windows machines running on fishtest.

No functional change

src/tt.cpp

@@ -87,7 +87,7 @@ void TranspositionTable::clear() {
       threads.push_back(std::thread([this, idx]() {
 
           // Thread binding gives faster search on systems with a first-touch policy
-          if (Options["Threads"] >= 8)
+          if (Options["Threads"] > 8)
               WinProcGroup::bindThisThread(idx);
 
           // Each thread will zero its part of the hash table