Merged revisions 231614 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r231614 | mnicholson | 2009-11-30 15:11:44 -0600 (Mon, 30 Nov 2009) | 8 lines
  
  Remove duplicate entries from voicemail format lists. This prevents app_voicemail from entering an infinite loop when the same format is specified twice in the format list.
  
  (closes issue #15625)
  Reported by: Shagg63
  Tested by: mnicholson
  
  Review: https://reviewboard.asterisk.org/r/429/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@231616 65c4cc65-6c06-0410-ace0-fbb531ad65f3