check_version: don't globber .git_version if we're not in a git repo
check_version: don't globber .git_version if we're not in a git repo

namely, when you extract the release tarball!

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph