Retiring iksemel (XMPP library)

[Jeffrey Ollie]

It's been FTBFS for a while and the current version has some insecure
settings so I propose retiring iksemel fairly soon. As far as I can see it
only affects Asterisk and Zabbix. Asterisk's use of iksemel is optional so
it should be easy to build without and I suspect the same is true of Zabbix.

-- 
Jeff Ollie
The majestik møøse is one of the mäni interesting furry animals in Sweden.