Skip this test on HHVM, as the timezone is 'UTC' there

Author: derickr

tests/bson/bug0631.phpt

@@ -1,5 +1,7 @@
 --TEST--
 PHPC-631: UTCDateTime::toDateTime() may return object that cannot be serialized
+--SKIPIF--
+<?php if (defined("HHVM_VERSION_ID")) exit("skip HHVM uses 'UTC' instead of '+00:00'"); ?>
 --INI--
 date.timezone=UTC
 --FILE--