[Pidgin] #15907: Remove discontinued Yahoo! functionality

[Pidgin]

#15907: Remove discontinued Yahoo! functionality
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 Reporter:  MarkDoliner  |       Owner:  EionRobb
     Type:  task         |      Status:  new
Milestone:  3.0.0        |   Component:  unclassified
  Version:               |  Resolution:
 Keywords:               |
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Comment (by mmcco):

 I agree. The remaining changes are probably pretty minor.

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Ticket URL: <https://developer.pidgin.im/ticket/15907#comment:11>
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