[Pidgin] #3922: Implement spam report for Yahoo! IM.

[Pidgin]

#3922: Implement spam report for Yahoo! IM.
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Reporter:  lhirlimann   |       Owner:  marv  
    Type:  enhancement  |      Status:  new   
Priority:  minor        |   Component:  Yahoo!
 Version:  2.2.2        |    Keywords:  spam  
 Pending:  0            |  
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 When using the official yahoo! IM client - when you receive a message from
 someone which is not in your contact list you get a pop-up asking if you
 want to block that user and report that user to Yahoo! as being a spammer.

 from http://trac.adiumx.com/ticket/8231
 >>My guess is there's a server-side list being maintained by Yahoo of
 spammers.
 >>You can mention that we believe the report spam to be similar to RBL's
 (Real Time Block Lists) for Yahoo contacts.

 filling here because there does not seem to be any bugs tracking this in
 libpurple.

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Ticket URL: <http://developer.pidgin.im/ticket/3922>
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