[5.4] Make RequestGuard Macroable (#19569)

* Create RequestGuard.php

use Illuminate\Support\Traits\Macroable;

* Update RequestGuard.php

Author: hezhiying

src/Illuminate/Auth/RequestGuard.php

@@ -4,10 +4,11 @@
 
 use Illuminate\Http\Request;
 use Illuminate\Contracts\Auth\Guard;
+use Illuminate\Support\Traits\Macroable;
 
 class RequestGuard implements Guard
 {
-    use GuardHelpers;
+    use GuardHelpers, Macroable;
 
     /**
      * The guard callback.