From: Yaroslav Halchenko <debian@onerussian.com>
Subject: use system-wide joblib and do not attempt to install joblib/test

Relies on DFSG-ed sources with no joblib present

Last-Update: 2020-01-12

--- a/sklearn/externals/setup.py
+++ b/sklearn/externals/setup.py
@@ -4,6 +4,5 @@
 def configuration(parent_package='', top_path=None):
     from numpy.distutils.misc_util import Configuration
     config = Configuration('externals', parent_package, top_path)
-    config.add_subpackage('joblib')
 
     return config
