replace sed with tr to remove \r from downloaded file

replace sed with tr to remove \r from downloaded file

On some systems, sed does not recognize \r in the pattern the way it
was used here.
Use tr instead because this works the same across systems.

(closes issue #14936)
Reported by: leobrown
Patches:
      2009042201_14936.diff.txt uploaded by mvanbaak (license 7)
	  Tested by: leobrown, mvanbaak

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@189849 65c4cc65-6c06-0410-ace0-fbb531ad65f3