Disable wayland dmabuf for the X11 backend

This is just too hard to get right and nobody will notice its
absence, so let's not bother for now (or ever, I hope)

src/modules/wl_x11/e_mod_main.c

@@ -49,6 +49,8 @@ e_modapi_init(E_Module *m)
    e_comp->pointer = e_pointer_canvas_new(e_comp->ee, EINA_TRUE);
    e_comp->pointer->color = EINA_TRUE;
 
+   e_comp_wl->dmabuf_disable = EINA_TRUE;
+
    return m;
 }