fix error when WITH_TESTING=OFF

cmake/util.cmake

@@ -107,7 +107,6 @@ function(link_paddle_exe TARGET_NAME)
         paddle_parameter
         paddle_proto
         paddle_cuda
-        paddle_test_main
         ${METRIC_LIBS}
         ${PROTOBUF_LIBRARY}
         ${LIBGLOG_LIBRARY}
@@ -156,7 +155,7 @@ endfunction()
 function(link_paddle_test TARGET_NAME)
     link_paddle_exe(${TARGET_NAME})
     target_link_libraries(${TARGET_NAME} ${GTEST_MAIN_LIBRARIES}
-        ${GTEST_LIBRARIES})
+        ${GTEST_LIBRARIES} paddle_test_main)
 endfunction()
 
 # add_unittest_without_exec