[Pidgin] #8690: Add authorization request message to callback

[Pidgin]

#8690: Add authorization request message to callback
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 Reporter:  cockroach  |        Owner:           
     Type:  patch      |       Status:  new      
Milestone:  2.8.0      |    Component:  libpurple
  Version:  2.5.5      |   Resolution:           
 Keywords:             |  
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Comment(by cockroach):

 Added enum for the return values & documentation to the patch

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Ticket URL: <http://developer.pidgin.im/ticket/8690#comment:9>
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