epoll.c test in CMakeLists.txt

tests/examples/c/CMakeLists.txt

@@ -5,6 +5,8 @@ IF (TD_LINUX)
   AUX_SOURCE_DIRECTORY(. SRC)
   ADD_EXECUTABLE(demo demo.c)
   TARGET_LINK_LIBRARIES(demo taos_static trpc tutil pthread )
+  ADD_EXECUTABLE(epoll epoll.c)
+  TARGET_LINK_LIBRARIES(epoll taos_static trpc tutil pthread )
 ENDIF ()
 IF (TD_DARWIN)
   INCLUDE_DIRECTORIES(. ${TD_COMMUNITY_DIR}/src/inc ${TD_COMMUNITY_DIR}/src/client/inc  ${TD_COMMUNITY_DIR}/inc)