[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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Changes (by darkrain42):

  * type:  enhancement => patch
  * milestone:  => 2.8.0


Comment:

 As I mentioned in #pidgin, it might be worthwhile adding an `enum` for the
 four magic values (and in even more of a nitpick, I'd change
 `plugin_return < 0` to `plugin_return == -1`).  That said, I don't care
 very much.

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Ticket URL: <http://developer.pidgin.im/ticket/8690#comment:8>
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