small fix (#13322)

Superjomn · web-flow · commit 0c7f883d4fae · 2018-09-14T07:31:25.000+08:00
diff --git a/paddle/fluid/string/CMakeLists.txt b/paddle/fluid/string/CMakeLists.txt
@@ -1,6 +1,5 @@
 cc_library(stringpiece SRCS piece.cc)
 cc_library(pretty_log SRCS pretty_log.cc)
-cc_test(test_pretty_log SRCS pretty_log.cc)
 cc_test(stringpiece_test SRCS piece_test.cc DEPS stringpiece glog gflags)
 cc_test(stringprintf_test SRCS printf_test.cc DEPS glog gflags)
 cc_test(to_string_test SRCS to_string_test.cc)
