Remove unused resource

The file resources/audio_coding/neteq_universal.rtp is no longer
used in any test. Removing the hash file neteq_universal.rtp.sha1.

BUG=2996
R=kjellander@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/17679004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6402 4adac7df-926f-26a2-2b94-8c16560cd09d