Link to libmutter always

Wayland support was merged into mutter master.

js/ui/main.js

@@ -103,9 +103,6 @@ function start() {
     global.logError = window.log;
     global.log = window.log;
 
-    if (!Meta.is_wayland_compositor)
-        Meta.is_wayland_compositor = function () { return false; };
-
     // Chain up async errors reported from C
     global.connect('notify-error', function (global, msg, detail) { notifyError(msg, detail); });