Use a deep copy on strings that come from ast_events. Otherwise it is

likely that after the event is freed, we no longer refer to valid memory.

(closes issue #12712)
Reported by: tomo1657
Patches:
      12712.patch uploaded by putnopvut (license 60)
Tested by: tomo1657



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@118157 65c4cc65-6c06-0410-ace0-fbb531ad65f3