[Pidgin] #13245: Fix up startup-notification implementation

[Pidgin]

#13245: Fix up startup-notification implementation
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Reporter:  davidben  |        Type:  patch       
  Status:  new       |   Component:  pidgin (gtk)
 Version:  2.7.9     |    Keywords:              
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 When Pidgin acts as a remote in single-instance mode, the remote does not
 clear the startup notification, causing the desktop to display a throbber
 until timing out. Also, remove the optional dependency on libstartup-
 notification as GTK has handled this at the toolkit level since 2.2.

 (And, as far as I can tell, libstartup-notification does not actually work
 anyway. If Pidgin starts as a status icon without opening a buddy list,
 the throbber does not disappear until I open the buddy list.)

 Full name and email address: David Benjamin <davidben AT mit DOT edu>

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Ticket URL: <http://developer.pidgin.im/ticket/13245>
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