[Pidgin] #15906: Remove Yahoo! Japan

[Pidgin]

#15906: Remove Yahoo! Japan
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 Reporter:  MarkDoliner  |      Owner:  sulabh.dev
     Type:  task         |     Status:  new
Milestone:  3.0.0        |  Component:  Yahoo!/Yahoo! JAPAN
  Version:               |   Keywords:
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 Yahoo! Messenger Japan will be shut down on March 26, according to
 http://messenger.yahoo.co.jp/close/

 We should remove our support for it in 3.0.0. We should remove
 libpurple/protocols/yahoo/libyahoojp.c We may also want to simplify the
 Yahoo! PRPL build process so that it doesn't build an intermediate library
 first.

 We probably don't need to remove Yahoo! Japan accounts from accounts.xml.
 They won't be useful and will show up with protocol "Unknown," but I think
 that's fine. And it's kind of a good idea not to delete people's data
 unexpectedly.

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Ticket URL: <https://developer.pidgin.im/ticket/15906>
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