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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.

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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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/sys/mcuimg.bin is just another file on SLFS, no reason to give it
special treatment. Preserve backward compatibility with old bundles:
translate sys_mcuimg.bin -> /sys/mcuimg.bin

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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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Make restful_server and netcat examples compilation tests:
 - netcat doesn't use HTTP, compile it with MG_DISABLE_HTTP
 - restful_server doesn't use websocket, compile it with
   MG_DISABLE_HTTP_WEBSOCKET

h/t @labourcier, cesanta/mongoose#665

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