SASL support for IRC in Pidgin

Squeeze’s Pidgin lacks SASL support for IRC.

This was implemented in 2.10.7. It’s a pain to backport for Squeeze, so we’ll have it once Tails is based on Wheezy.

Let’s test this is indeed fixed in Tails based on Wheezy.

Original created by @tails on 5679 (Redmine)

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