Add NO_CHECK_TIME to SSLTest.ECHBuiltinVerifier too

That test cert expires in 2099, which is a ways off but if this code is
somehow still around by then, let's save the future some pain. With this
fixed, our test all pass at least through the year 3000, so we're
hopefully clear of timebombs.

Change-Id: Ie9dcbc4f4db70c6bcc1ae9717c6e1ee89eb4195c
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/55625
Auto-Submit: David Benjamin <davidben@google.com>
Reviewed-by: Bob Beck <bbe@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Bob Beck <bbe@google.com>

ssl/ssl_test.cc

@@ -2267,6 +2267,8 @@ XRqE7XFhHL+7TNC2a9OOAjQsEF137YPWo+rhgko=
   ASSERT_TRUE(X509_STORE_add_cert(store.get(), root.get()));
   SSL_CTX_set_cert_store(client_ctx.get(), store.release());
   SSL_CTX_set_verify(client_ctx.get(), SSL_VERIFY_PEER, nullptr);
+  X509_VERIFY_PARAM_set_flags(SSL_CTX_get0_param(client_ctx.get()),
+                              X509_V_FLAG_NO_CHECK_TIME);
   static const char kSecretName[] = "secret.example";
   ASSERT_TRUE(X509_VERIFY_PARAM_set1_host(SSL_CTX_get0_param(client_ctx.get()),
                                           kSecretName, strlen(kSecretName)));