a quick fix to pbx_dundi.c to make it so it will compile. Hope I did the right...

a quick fix to pbx_dundi.c to make it so it will compile. Hope I did the right thing. And some additions to removal of extens to take care of hashtab pointers in all cases.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89388 65c4cc65-6c06-0410-ace0-fbb531ad65f3