Same problem here. I tried to work around this problem by creating some symlinks in /usr/lib/x86_64-linux-gnu/irssi/modules.
Now, I get this error: -!- Irssi: xmpp/core is ABI version 0 but Irssi is version 1, cannot load -!- Irssi: Error loading module xmpp/fe: /usr/lib/x86_64-linux-gnu/irssi/modules/libfe_xmpp.so: undefined symbol: xmpp_subscription -!- Irssi: xmpp/core is ABI version 0 but Irssi is version 1, cannot load -!- Irssi: Unknown chat protocol: XMPP Maybe the plugin simply needs to be recompiled against the new irssi version?
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