Issue #15301: Enhance os.*chown() testing.  Based on patch by Larry Hastings.
Issue #17248: Fix os.*chown() testing when user has group root.
fix building without pymalloc (closes #17228)
- Issue #16248: Disable code execution from the user's home directory by
  tkinter when the -E flag is passed to Python.  Patch by Zachary Ware.
null merge from 2.6
#17265: fix highlight in template example.  Initial patch by Berker Peksag.
Issue #17248: Fix os.*chown() testing when user is in root group.