Merged revisions 49581 via svnmerge from

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

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r49581 | kpfleming | 2007-01-04 17:50:15 -0600 (Thu, 04 Jan 2007) | 3 lines

create the IAX2 processing threads as background threads so they will use smaller stacks
when we create a dynamic thread, put it on the dynamic_list right away so we don't lose track of it

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@49584 65c4cc65-6c06-0410-ace0-fbb531ad65f3