Merge pull request #9925 from takluyver/pep527

Only make .tar.gz sdists when releasing

tools/toollib.py

@@ -18,7 +18,7 b" archive = '%s:%s' % (archive_user, archive_dir)"
 
 # Build commands
 # Source dists
-sdists = './setup.py sdist --formats=gztar,zip'
+sdists = './setup.py sdist --formats=gztar'
 # Binary dists
 def buildwheels():
     sh('python3 setupegg.py bdist_wheel' % py)