Merged revisions 120908 via svnmerge from

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

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r120908 | jpeeler | 2008-06-06 13:05:15 -0500 (Fri, 06 Jun 2008) | 1 line

only define thread storage variable if necessary for LOW_MEMORY
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@120909 65c4cc65-6c06-0410-ace0-fbb531ad65f3