Remove clean_sky_package.py

This script is unused.

sky/build/clean_sky_package.py

@@ -1,35 +0,0 @@
-#!/usr/bin/env python
-# Copyright 2015 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import argparse
-import os
-import shutil
-
-def remove_empty_dirs(root_dir):
-    for root, dirs, _ in os.walk(root_dir):
-         for name in dirs:
-             fname = os.path.join(root, name)
-             if not os.listdir(fname):
-                 os.removedirs(fname)
-
-def main():
-    parser = argparse.ArgumentParser(
-        description='Clean Sky package for distribution')
-    parser.add_argument('package_dir', type=str)
-    parser.add_argument('--touch', type=str)
-    args = parser.parse_args()
-
-    remove_empty_dirs(args.package_dir)
-
-    material_design_icons = os.path.join(args.package_dir, 'lib/assets/material-design-icons')
-    if os.path.exists(material_design_icons):
-        shutil.rmtree(material_design_icons)
-
-    with open(args.touch, 'w') as f:
-        pass
-
-
-if __name__ == '__main__':
-    main()