try to fix win32 release

Author: erh

dbtests/spin_lock_test.cpp

@@ -16,6 +16,7 @@
  *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "../pch.h"
 #include <boost/thread/thread.hpp>
 
 #include "dbtests.h"