Windows CI fixup.

Author: kwlzn

notebook/notebookapp.py

@@ -63,7 +63,8 @@
 from tornado import web
 from tornado.httputil import url_concat
 from tornado.log import LogFormatter, app_log, access_log, gen_log
-from tornado.netutil import bind_unix_socket
+if not sys.platform.startswith('win'):
+    from tornado.netutil import bind_unix_socket
 
 from notebook import (
     DEFAULT_NOTEBOOK_PORT,