add a special Provides: to all login manager packages

[Kevin Kofler]

Christoph Wickert wrote:
> There are other ways to store passwords than gnome-keyring-daemon and
> there are ways to manage your networking than NM-gnome.

Yeah, that too. In fact not needing gnome-keyring-daemon is why I use the
KDE 3 knetworkmanager and will switch to the Plasma (KDE 4) NM applet as
soon as it's ready.

        Kevin Kofler