Remove global variable that makes dlopen unhappy

Remove global variable that makes dlopen unhappy

This isn't the best way to do this, but it is the easiest. There are some
limitations that are going to need to be addressed at some point with reloads
and when I (or someone else) work on that, then the API can be updated to
handle passing the private config data that the calendar tech modules need in
a better way as well.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@223016 65c4cc65-6c06-0410-ace0-fbb531ad65f3