plugins_mirror cannot depend on polyglot

setup/plugins_mirror.py

@@ -31,7 +31,6 @@ from contextlib import closing
 from datetime import datetime
 from email.utils import parsedate
 from functools import partial
-from polyglot.builtins import filter, map, zip
 from multiprocessing.pool import ThreadPool
 from xml.sax.saxutils import escape, quoteattr
 # }}}