Fix, that display only build under Linux works
diff --git a/vk-layer-generate.py b/vk-layer-generate.py
index 5301e26..015826f 100755
--- a/vk-layer-generate.py
+++ b/vk-layer-generate.py
@@ -1028,6 +1028,9 @@
                                  ('xlib_enabled', ['vkCreateXlibSurfaceKHR']),
                                  ('wayland_enabled',  ['vkCreateWaylandSurfaceKHR']),
                                  ('mir_enabled', ['vkCreateMirSurfaceKHR'])]
+        elif self.wsi == 'Display':
+            instance_extensions=[('wsi_enabled', surface_wsi_instance_exts),
+                                 ('display_enabled', display_wsi_instance_exts)]
         else:
             print('Error: Undefined DisplayServer')
             instance_extensions=[]
@@ -1049,6 +1052,7 @@
             "Xlib",
             "Wayland",
             "Mir",
+            "Display",
     }
 
     subcommands = {