Server has a high CPU usage when idle.
This is due to the game running in a very tight loop using clock_gettime and futex (it is always wrong to use these two together).
Steps to Reproduce
1. start Don't Starve Together dedicated server
2. see very high CPU usage with top/htop tools
3. attach to the process with `strace -p 123456`
3. see the very inefficient locking and high precision time sampling
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