Revert previous patch

It raises an assert under Windows, it is not clear why but it
happens that idle_loop() is called with incorrect threadID and
the assert triggered is:

assert(threadID >= 0 && threadID < MAX_THREADS);

So revert the patch for now, but we should understand why it
fails.

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

src/search.cpp

@@ -2768,6 +2768,9 @@ namespace {
             cout << "Failed to create thread number " << i << endl;
             Application::exit_with_failure();
         }
+
+        // Wait until the thread has finished launching and is gone to sleep
+        while (threads[i].state != THREAD_SLEEPING);
     }
   }