[Pidgin] #519: Allow a filtering function in the buddy autocompletion

[Pidgin]

#519: Allow a filtering function in the buddy autocompletion
--------------------------+-------------------------------------------------
 Reporter:  lmfe          |       Type:  defect
   Status:  new           |   Priority:  minor 
Component:  pidgin (gtk)  |    Version:  2.0   
 Keywords:                |    Pending:  0     
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 This patch exposes a new function in gtkutils.h, which
 I called
 gaim_gtk_setup_screenname_autocomplete_with_filter for
 the lack of a better name.
 This sets up buddy autocompletion in a GtkEntry widget,
 but filters the buddies that will be available to
 autocomplete according to a user-defined function.

 The old function gaim_gtk_setup_screenname_autocomplete
 was implemented with a call to the new function,
 showing that the patch is working =)

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Ticket URL: <http://developer.pidgin.im/ticket/519>
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