Fix regression with distinctive ring detection.

The issue here is that passing an array to a function prohibits the ARRAY_LEN
macro from returning the real size. To avoid this the size is now defined and
use of ARRAY_LEN is avoided.

(closes issue #15718)
Reported by: alecdavis
Patches: 
      bug15718.patch uploaded by jpeeler (license 325)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@277837 65c4cc65-6c06-0410-ace0-fbb531ad65f3