Make sure that since we are passing -c to asterisk that we have a console.

Without this line, Asterisk will busy-loop trying to read and write to
/dev/null (woops... my bad).


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@206225 65c4cc65-6c06-0410-ace0-fbb531ad65f3