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Re-add _ast_mem_backtrace_buffer variable for ABI compatibility.
Modules built prior to commit of r4502 expect to link at runtime
to the variable _ast_mem_backtrace_buffer. This change re-adds
the variable to the C file only.
Review: https://reviewboard.asterisk.org/r/4558/
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@433796
65c4cc65-6c06-0410-ace0-
fbb531ad65f3