Add 'l' option to CDR dialplan function which will cause it to pass the last...

Add 'l' option to CDR dialplan function which will cause it to pass the last CDR record to getvar instead of the first. (issue #7689 reported by voipgate)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@40226 65c4cc65-6c06-0410-ace0-fbb531ad65f3