[Pidgin] #4061: Don't allow adding a buddy to prpls that don't have an add_buddy callback

[Pidgin]

#4061: Don't allow adding a buddy to prpls that don't have an add_buddy callback
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 Reporter:  datallah      |       Owner:  datallah
     Type:  task          |      Status:  new     
 Priority:  minor         |   Milestone:  3.0.0   
Component:  pidgin (gtk)  |     Version:  2.2.2   
 Keywords:                |     Pending:  0       
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 This allows us to more sanely prevent people from adding buddies to stuff
 like bonjour that don't support a manually managed list.

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Ticket URL: <http://developer.pidgin.im/ticket/4061>
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