weston should now be able to pick it's own display for screenshare

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2723 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
Give Supertux GL another chance, it was a debugging option that was on

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2724 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
Elementary changed some variables a bit for Wayland

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2725 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
Make supertux gl use the correct default renderer

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2726 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9