Bring printf into scope in timesync.cpp

Livox-SDK / livox_ros_driver

Livox device driver under ros, support Lidar Mid-40, Mid-70, Tele-15, Horizon, Avia.

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Closed 3noch closed 3 years ago

3noch commented 3 years ago

Slight changes in compilation order can cause the use of printf to fail without <cstdio> included.