[opus] Unknown versions in git.

[bat guano]

"unknown" usually means this 
> script failed to extract a version for some reason (couldn't run git, or 
> your git version was too old).

"script failed to extract a version"
Yes, failed to extract a version.

But I'm not going to re-compile git.

@ubuntu:~$ git --version
git version 1.7.4.1



I will use opus_1.1-beta and opus-tools_0.1.7 "tar.gz" downloads from xiph instead.