message: fix test Makefile
  Summary:
  Pull Request resolved:
  (https://github.com/facebook/redex/commit/6ee0946069d7e92f0af3d5343402844181e3c4a2) broke CircleCI
diff: @@ -29,6 +29,7 @@ check_PROGRAMS = \
  constructor_analysis_test \
  control_flow_test \
  copy_propagation_test \
  + cpp_util_test \
  cse_test \
  creators_test \
  debug_info_test \
  @@ -181,6 +182,7 @@ control_flow_test_LDADD = $(COMMON_MOCK_TEST_LIBS)
  copy_propagation_test_SOURCES = CopyPropagationTest.cpp
  cpp_util_test_SOURCES = CppUtilTest.cpp
  +cpp_util_test_LDADD = $(COMMON_MOCK_TEST_LIBS) -lpthread
  cse_test_SOURCES = CommonSubexpressionEliminationTest.cpp
  cse_test_LDADD = $(COMMON_MOCK_TEST_LIBS)
  