Log Message:
irssi*: security update to 1.0.6.

v1.0.6 2018-01-07 The Irssi team <staff@irssi.org>
	- Fix invalid memory access when reading hilight configuration
          (#787, #788).
	- Fix null pointer dereference when the channel topic is set
          without specifying a sender (GL#20, GL!25).
	- Fix return of random memory when using incomplete escape
          codes (GL#21, GL!26).
	- Fix heap buffer overflow when completing certain strings
          (GL#19, GL!27).
	- Fix return of random memory when using an incomplete
          variable argument (GL#18, GL!28).