fix errors

JiayiFeng · JiayiFeng · commit b1f647fd6de0 · 2018-03-07T19:21:26.000+08:00
diff --git a/paddle/fluid/operators/reader/create_double_buffer_reader_op.cc b/paddle/fluid/operators/reader/create_double_buffer_reader_op.cc
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <condition_variable>
+#include <mutex>
 #include <thread>
 #include "paddle/fluid/operators/reader/reader_op_registry.h"
 
