makes externtcpport and externtlsport static variables

externtcpport and externtlsport need to be declared as static
variables.  Thanks to russell for finding and pointing this out.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@222947 65c4cc65-6c06-0410-ace0-fbb531ad65f3