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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Newlib implements rename as _link and _unlink, not _rename.
There is no _link on either SLFS or SPIFFS, so override rename directly.

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!): Fix for compile error in Android.

Remember sorting settings in url fragment, reverse order on repeated
header click.

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SimpleLink restart invalidates all sockets.
Listeners are restarted, outgoing connections are closed.

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cesanta/mongoose#677

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Domain name verification feature was added in NWP service pack
(reported version: 2.6.0.5). Older versions do not support it.
There's not much we can do about it, so we just ignore the error.

PUBLISHED_FROM=9495250de1945aae4f2bdf7dddcd7bf1248e24c2

Frees up ~19KB RAM:

Before:
  Code size: 210616
  RAM at startup: 48636 total, 34472 free
  RAM after sys init: 15024 free

After:
  Code size: 195784
  RAM at startup: 65096 total, 52980 free
  RAM after sys init: 34116 free

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