2008-01-28  Brian Cameron  <brian.cameron@sun.com>

        * acconfig.h, configure.ac, gui/simple-greeter/Makefile.am,
          gui/simple-greeter/gdm-greeter-login-window.c:  Make
          polkit-gnome an optional dependency.  Also support
          RBAC for shutdown/reboot if the --enable-rbac-shutdown
          configure option is provided.
        * configure.ac: Remove old RBAC configuration options that
          were used in the GDM 2.20 branch.
        * gui/simple-greeter/gdm-chooser-widget.c: Fix a null string
          argument problem causing core dumping on Solaris.

svn path=/trunk/; revision=5640