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We’ve neglected to manually update this file once too often — it’s been
out of date for important new symbols (for example,
nice_agent_get_io_stream()) since at least 0.1.11.

Since the format is a simple extension of libnice.sym, we might as well
automatically generate it at dist time.

Adds new API: nice_agent_set_local_credentials().

Nice to make debug logs more friendly to read.

This should be used only when the protocol has it's own keepalive mechanism