cmake HAVE_TRUNC examples

kevin2431/Traj-LO thirdparty/ros/ros_comm/clients/roscpp/CMakeLists.txt :68 

CHECK_FUNCTION_EXISTS(trunc HAVE_TRUNC)

superxiaobai-1/ros_protobuf_msg roscpp/CMakeLists.txt :70 

CHECK_FUNCTION_EXISTS(trunc HAVE_TRUNC)

luigifreda/slamplay thirdparty/ros/ros_comm/clients/roscpp/CMakeLists.txt :68 

CHECK_FUNCTION_EXISTS(trunc HAVE_TRUNC)