Suppress jsshell test for build directory too

BUG=

Review URL: https://codereview.chromium.org//831003003
diff --git a/.status b/.status
index 9f716cd..10b5bf6 100644
--- a/.status
+++ b/.status
@@ -40,6 +40,7 @@
 
 [ $runtime == jsshell ]
 test/number_closure_test: Fail # Doesn't support timer > 0, used in async test
+build/test/number_closure_test: Fail # Doesn't support timer > 0, used in async test
 
 [ $compiler == dart2js && $runtime == chromeOnAndroid ]
 build/test/date_time_format_http_request_test: Fail # TODO(kasperl): Please triage.