[Pidgin] #1344: fix for some build warnings

[Pidgin]

#1344: fix for some build warnings
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  Reporter:  o_sukhodolsky  |       Owner:  rlaager 
      Type:  patch          |      Status:  assigned
  Priority:  minor          |   Milestone:  2.0.2   
 Component:  pidgin (gtk)   |     Version:  2.0.1   
Resolution:                 |    Keywords:          
   Pending:  0              |  
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Comment (by rlaager at pidgin.im):

 (In [1411afd7660760db59966c3a9f18e2adab8eb27e]) Mark the return type const
 for the following functions.  I noticed this
 while fixing some DBus stuff which I'll commit shortly.

 * purple_accounts_get_all
 * purple_connections_get_all
 * purple_connections_get_connecting
 * purple_conv_chat_get_ignored
 * purple_conv_chat_get_users
 * purple_get_chats
 * purple_get_conversations
 * purple_get_ims
 * purple_notify_user_info_get_entries

 References #1344

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Ticket URL: </ticket/1344#comment:51>
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