[PATCH xdm] Support systemd startup notification.

[Jamey Sharp]

I don't see any issues with this patch except:

On 9/28/11, Michał Górny <mgorny at gentoo.org> wrote:
> --- a/configure.ac
> +++ b/configure.ac
> @@ -146,6 +146,7 @@ if test "x$USE_SELINUX" != "xno" ; then
>  fi
>
>  # Check whether to install systemd unit files, as suggested in daemon(7).
> +# When a full patch is specified, this not require systemd installed.

Replace "patch" with "path", and insert "this *does* not".

Otherwise, I'd prefer somebody who cares about XDM to review, but I'm
happy to throw in my:

Reviewed-by: Jamey Sharp <jamey at minilop.net>