setup-phase3: don't install tmux/svn/python2
setup-phase3: don't install tmux/svn/python2

I never use svn anymore, am currently using dvtm+dtach rather than tmux
(though that may change again at some point), and I usually install
python2 via pyenv.

Signed-off-by: Christopher Larson <151ee9d8882c48b2c49fd3831d428f4779cb63b5@gmail.com>

kergoth/kergoth-arch-setup