[Pidgin] #2437: PurpleAccountUiOps.request_authorize's callbacks have incorrect types.

[Pidgin]

#2437: PurpleAccountUiOps.request_authorize's callbacks have incorrect types.
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  Reporter:  resiak     |       Owner:       
      Type:  defect     |      Status:  new  
  Priority:  minor      |   Milestone:       
 Component:  libpurple  |     Version:  2.1.0
Resolution:             |    Keywords:       
   Pending:  0          |  
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Changes (by resiak):

  * milestone:  3.0.0 =>

Comment:

 datallah pointed out that fixing this just makes compiling UIs that
 haven't been correspondingly fixed give an "initialization from
 incompatible pointer type" warning, and no ill effects.

 The attached patch fixes the issue.  Can this go into 2.1.1?  If not,
 should I make a 2.2 branch in mtn?

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Ticket URL: <https://developer.pidgin.im/ticket/2437#comment:1>
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