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Note: this is only the first step; the C sources won't be built until
the second step is done.

The actual build takes about 1.3s on cloud2 which still runs the docker
containers and image layers on the very slow spinning disk. cloud3 has
docker mounted on the SSD disk; measured speedups of 20-30%

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Remove the random() stubs from the codebase

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Use the same config mechanism for ro_vars as for sys_config, get rid of a bunch of custom code.

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