pidgin/pidgin

Remove NS_AVATAR_0_12_* namespaces

2021-03-13, Arkadiy Illarionov
88c703b00fa7
Remove NS_AVATAR_0_12_* namespaces

XEP-0084 v0.12 User Avatar is deprecated

Testing Done:
Compile, run.

Bugs closed: PIDGIN-17493

Reviewed at https://reviews.imfreedom.org/r/570/
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