have drdr ignore stderr that doesn't matter

pkgs/racket-pkgs/racket-test/tests/pkg/util.rkt

@@ -114,6 +114,7 @@
 (define *index-ht-1* (make-hash))
 (define *index-ht-2* (make-hash))
 (define (start-pkg-server index-ht port)
+  (parameterize ([current-error-port (current-output-port)])
     (serve/servlet (pkg-index/basic
                     (λ (pkg-name)
                       (define r (hash-ref index-ht pkg-name #f))
@@ -122,7 +123,7 @@
                     (λ () index-ht))
                    #:command-line? #t
                    #:servlet-regexp #rx""
-                 #:port port))
+                   #:port port)))
 
 (define servers-on? #f)
 (define (with-servers* t)