Add .git.diff.order file
    
    Commit 97a85089d67 ("Make do-rebase generate proper patches regardless of
    git config") changed do-rebase to generate patches as expected by the pkg
    but unfortunately it missed the file to control the order in which files
    appear in the output.
    
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>