[Pidgin] #14248: Update libgadu to 1.11.0

[Pidgin]

#14248: Update libgadu to 1.11.0
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Reporter:  tomkiewicz  |        Type:  defect   
  Status:  new         |   Component:  Gadu-Gadu
 Version:  2.7.11      |    Keywords:  libgadu  
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 New libgadu was released a week ago.

 Among others, it introduces some features, that will help us dealing with
 connection errors (see 1102, 1104, 1105 on svn). Also, it can enforce SSL
 connections (see 1093) - that means, if SSL connection will be
 unsuccessful, it won't fall back to plain-text mode.

 I have reduced differences with upstream version of libgadu to minimum, so
 following updates will be easier. Also, I managed to fix all warnings when
 building and some bugs that was present in our fork of libgadu.

 This version was tested under Linux 32bit and Windows 7 32bit (cywgin).

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Ticket URL: <http://developer.pidgin.im/ticket/14248>
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