Update changelog

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
release.sh: Work around autotools search path wackiness

When we test our release candidate tarball, we do not want autotools to
pick up any files from the git repo.  So "bury" the build directory a few
levels deeper under tmp.build/.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>