Pass also opponent time to think()

This patch modifies think() signature to accept
also opponent time. This is needed for future
changes to time managment.

Still no functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/benchmark.cpp

@@ -124,6 +124,6 @@ void benchmark(const std::string& commandLine) {
   {
       Move moves[1] = {MOVE_NONE};
       Position pos(*it);      
-      think(pos, true, false, 0, 0, 0, 0, 0, secsPerPos * 1000, moves);
+      think(pos, true, false, 0, 0, 0, 0, 0, 0, secsPerPos * 1000, moves);
   }
 }