Log Message:
Changes 1.1.10 (toolkit):
* More string format fixes in silcd and client libary
* configure: changed AC_PROG_LIBTOOL order to fix disabling shared libs
* configure: check threads support in OpenBSD
* Fixed string format vulnerability in client entry handling
* Reported and patch provided by William Cummings
* silcd: Fixed IDENTIFY command reply handling for channels

Changes 1.1.18 (server):
* silcd: Added heartbeat support
* Added support for sending SILC_PACKET_HEARTBEAT packets to connection,
  to make sure they keep alive and to detect if they have died
* Set SO_KEEPALIVE for all accept()ed sockets
* silcd: Fixed SIGUSR1 signal handling
* Fixed the SIGUSR1 signal handling which can be used to dump the server
  internals to /tmp.
* Changed also End of Stream handling to handle NULL idata pointer instead
  of ignoring the EOS in case it is NULL.
* Changed also the DETACH timeout handling to use the packet stream
  directly instead of looking up client in the callback
* More string format fixes in silcd and client libary