No, this is the correct place. Have you pulled new commits to your
lilypond sources? I've pushed these two branches barely before
sending that email.
If you did pull and still don't have these branches, you probably just
have old git version which doesn't fetch them (for whatever reason).
What 'git --version' tells you? If it reports a version older than
1.7.9, i strongly suggest upgrading:
sudo add-apt-repository ppa:git-core/ppa
sudo apt-get update
sudo apt-get install git
after doing this 'git --version' should report 1.8.something.
Do I use some of your scripts to merge the branches?
The script for building lilypond (build-lily.sh) can do the merge for
you (for the sake of building), but the branches have to exist in your
repository.