supertux takes two dashes. not one

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2701 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
waylandloginmanager: Don't thrash the CPU when Zenity doesn't work

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2702 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9