Closes #22188: test_gdb now runs gdb with -nx: "Do not execute commands from
any .gdbinit initialization files".
backout changeset e0510a3bdf8f - due to buildbot failures. Ref: Issue #8797
Removed useless Py_LIMITED_API checks.
Support for Py_LIMITED_API was introduced in Python 3.2.
Thanks Arfrever Frehtes Taifersar Arahesis.
Issue #22201: Command-line interface of the zipfile module now correctly
extracts ZIP files with directory entries.  Patch by Ryan Wilson.
Issue #22068: Avoided reference loops with Variables and Fonts in Tkinter.
Clean up test_user_command.