Update net/tinc to version 1.0.23.

Changes since version 1.0.22:
 - Check for writability when waiting for a socket to finish connecting.
 - Don't send PING requests on connections which are not active yet.
 - Fix segfault when Name = $HOST but $HOST is not set.
 - Fix typos in the documentation.
 - Modernize the build system.
 - Get rid of the splay tree implementation.
 - Add description of IffOneQueue and MaxTimeout to the info manual.
 - Clean up child processes from proxy type exec.
Updated net/tinc to 1.0.23
Remove obsolete patch, noticed by adam@, thank you.