Updated Ubuntu build script

[Bill Spitzak]

My errors went away after I did a "git clean -x -f -d" in all the git 
directories, and deleted the entire old ~/install directory.

The result is pretty much what I had before, weston runs but no clients 
run, they all say "failed to create display: Permission denied"

So your script worked for me, as far as I can tell. I applied the 
following patch to it to make it put the git directories in the same 
location your previous one did:

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