fix compiler error when do not have TensorRT library

paddle/fluid/operators/CMakeLists.txt

@@ -227,6 +227,8 @@ op_library(softmax_op DEPS softmax)
 op_library(sequence_softmax_op DEPS softmax)
 if (WITH_GPU AND TENSORRT_FOUND)
     op_library(tensorrt_engine_op DEPS tensorrt_engine)
+else()
+    set(DEPS_OPS ${DEPS_OPS} tensorrt_engine_op)
 endif()
 op_library(sum_op DEPS selected_rows_functor)
 op_library(sgd_op DEPS selected_rows_functor)