Test: add 5s per-request tcp-set-timeout in http-request helper

ober

b04ad4d3d0d7f04ef1f8e9a1318e84bd912e972d

diff --git a/tests/httpd-test.ss b/tests/httpd-test.ss
index 612d89d..dfd1f24 100644
--- a/tests/httpd-test.ss
+++ b/tests/httpd-test.ss
@@ -42,6 +42,7 @@
   ;; args: optional body string
   (let* ([body (if (null? args) #f (car args))]
          [fd (tcp-connect "127.0.0.1" port)]
+         [_to (tcp-set-timeout fd 5 5)]
          [conn (conn-wrap fd)])
     (dynamic-wind
       void