Make sure Blender's build date is always in expected format

benchmark/foundation/third_party/dateutil/tz/tz.py

@@ -14,7 +14,7 @@ import sys
 import os
 import bisect
 
-from six import string_types
+from ..six import string_types
 from ._common import tzname_in_python2, _tzinfo, _total_seconds
 from ._common import tzrangebase, enfold
 from ._common import _validate_fromutc_inputs