Update net/erlang-xmpp to 1.1.5.

- Fix translation order
- Add legacy auth stream feature support
- Better support subtags with empty namespaces
- Add dialback feature support
- Fix error generation for raw xml elements
- Treat unknown message type as "normal"
- Allow including #text{} elements into #sm_failed{}
- Add xmpp:del_meta/2 function
- Fix typo in add_delay_info/4
- Make it possible to get text by lang
- Don't crash if previous delay tag misses 'from' attribute

(fhajny)