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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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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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SimpleLink sockets are suffciently different from BSD that all the
ifdefs have become too messy to warrant a separate net_if
implementation. As part of this we also implement proper async connect
support.

Added MG_F_SSL to identify SSL-enabled connections in a generic way,
since SSL state can be different depending on the implementation.

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SL requires cert and key to be separate files in DER format.

Date verification is disabled for now.

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