[Pidgin] #14936: Port to Farstream

[Pidgin]

#14936: Port to Farstream
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 Reporter:  ocrete                  |        Owner:  Maiku          
     Type:  patch                   |       Status:  new            
Milestone:  Patches Needing Review  |    Component:  Voice and Video
  Version:  2.10.1                  |   Resolution:                 
 Keywords:                          |  
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Comment(by QuLogic):

 I don't think we can switch to Farstream unconditionally.

 Are all these changes required for the switch? For example, the
 `stream->supports_add` addition doesn't seem to need Farstream.

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Ticket URL: <http://developer.pidgin.im/ticket/14936#comment:2>
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