loader: Return NULL for WSI entrypoints if extension not enabled
diff --git a/loader/wsi_lunarg.h b/loader/wsi_lunarg.h
index fd1b6da..02ff37e 100644
--- a/loader/wsi_lunarg.h
+++ b/loader/wsi_lunarg.h
@@ -39,8 +39,10 @@
 
 void *wsi_lunarg_GetInstanceProcAddr(
         VkInstance                              instance,
-        const char*                             pName);
+        const char*                             pName,
+        bool*                                   enabled);
 
 void *wsi_lunarg_GetDeviceProcAddr(
         VkDevice                                device,
-        const char*                             pName);
+        const char*                             pName,
+        bool*                                   enabled);