irssi: security bump to version 1.0.6

>From the advisory (https://irssi.org/security/irssi_sa_2018_01.txt):

Multiple vulnerabilities have been located in Irssi.

(a) When the channel topic is set without specifying a sender, Irssi
    may dereference NULL pointer. Found by Joseph Bisch. (CWE-476)

    CVE-2018-5206 was assigned to this issue.

(b) When using incomplete escape codes, Irssi may access data beyond
    the end of the string. (CWE-126) Found by Joseph Bisch.

    CVE-2018-5205 was assigned to this issue.

(c) A calculation error in the completion code could cause a heap
    buffer overflow when completing certain strings. (CWE-126) Found
    by Joseph Bisch.

    CVE-2018-5208 was assigned to this issue.

(d) When using an incomplete variable argument, Irssi may access data
    beyond the end of the string. (CWE-126) Found by Joseph Bisch.

    CVE-2018-5207 was assigned to this issue.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit aebdb1cd4b4034542eb7c50fc4b6a265c5ba5c77)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/irssi/irssi.hash

@@ -1,4 +1,4 @@
 # Locally calculated after checking pgp signature
-sha256	c2556427e12eb06cabfed40839ac6f57eb8b1aa6365fab6dfcd331b7a04bb914  irssi-1.0.5.tar.xz
+sha256	029e884f3ebf337f7266d8ed4e1a035ca56d9f85015d74c868b488f279de8585  irssi-1.0.6.tar.xz
 # Locally calculated
 sha256	a1a27cb2ecee8d5378fbb3562f577104a445d6d66fee89286e16758305e63e2b  COPYING

package/irssi/irssi.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-IRSSI_VERSION = 1.0.5
+IRSSI_VERSION = 1.0.6
 IRSSI_SOURCE = irssi-$(IRSSI_VERSION).tar.xz
 # Do not use the github helper here. The generated tarball is *NOT* the
 # same as the one uploaded by upstream for the release.