More reworking for rdgo compatibility
    
    Right now rdgo doesn't substitutite `%global commit`, which
    caused the `pushd atomic-%{commit}` to break.  It's simpler
    if we rework things so the default cwd is the srcdir, and only
    pushd/popd to registry.
    
    While I'm here change to `>=` for comparison since it seems
    more standard.