Adding new stun API stun_agent_forget_transaction to forget a saved transaction id when the transaction times out

Add an else to HAVE_CONFIG_H in order to define NICEAPI_EXPORT. Also removed that define from not public functions and removed them from libnice.sym

Remove the nice_agent_recv/recv_sock/poll_read APIs because they are useless now. We want to enforce using the gmainloop as it is necessary for a lot of other stuff

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