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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Which disables tokenizer, parser, AST, and compiler. On ESP8266, it
frees 21K of ROM.

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So that socket/connection/whatever is really closed by the time user code is run.

Speed up test_http_endpoints by using appropriate wait conditions.

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That don't have CONSOLE_UART defined

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Do not use CA bundle on CC3200, it doesn't work.
Make ssl_ca_cert = "*" mean "no verification" and make sure
SSL is enabled on the connection when it's required, even w/o verification.

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