Update silc-server to 0.8.

Patches contributed by Lubomir Sedlacik <salo@Xtrmntr.org> in PR 15779

Changes from 0.7.9 to 0.8:
==========================

* Removed 0.6.x backwards support.
* Added `prefer_ipv6' argument to the functions
  silc_net_gethostbyname[_async].  If it is TRUE it will return
  IPv6 address over IPv4.  If FALSE IPv4 address is returned
  even if IPv6 address was found.
* Added support silc_net_create_connection[_async] to fallback
  to IPv4 address if IPv6 address could not be used (like if
  it doesn't work on a specific system).  Affected file in
* Added `user_count' to the SilcChannelEntry which now tells the
  number of users on the channel.  The user count is now saved
  in normal server of global channels as well.
* Added following new config file settings:
  channel_rekey_secs, key_exchange_rekey, key_exchange_pfs,
  key_exchange_timeout, conn_auth_timeout, connections_max,
  links_max.
  Implemented all the new config settings handling in the server.
  Optimized the use of SKE Mutual flag usage.  Use it only
  if connection authentication protocol is not based in public
  key authentication.
* Added new configuration options and blocks:
  keepalive_secs, reconnect_count, reconnect_interval,
  reconnect_interval_max, reconnect_keep_trying and
  require_reverser_lookup.  Added ConnectionParam block, and
  implemented the connection parameters when connecting as
  initiator and when accepting connections as responder.
* Splitted the doc/example_silcd.conf.in.  Separated the crypto
  algorithm parts and created new file silcalgs.conf, that
  is now included from the example_silcd.conf.in.
* Optimized the silc_server_connect_to_router_second to take
  the connection configuration object from the SilcServerConnection
  object instead of finding it during the connecting phase.
  Added the configuration object to SilcServerConnection struct.
* Fixed the public key authentication to allocate always the
  destination signature buffer instead of using static buffer.
* Added new Passphrase and Publickey authentication methods to
  config file, allowing both public key and passphrase based
  authentication to be set at the same time.
  Added `prefer_passphrase_auth' setting in config file which
  can be used to set to prefer passwd auth if both passwd and
  public key is set.  If not set, public key is preferred.
  This has effect only when being initiator (responder will try
  both anyway).
  Added support for authentication with passphrase and public key
  at the same time.  The passphrase is tried first always since
  it is faster to check.
* Merged the new SILC Config library, with the server parsing
  support.  Read the header file silcconfig.h or the toolkit
  documentation for the news.

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