Issue #4331: Added functools.partialmethod

Initial patch by Alon Horev
Close #19439: execute embedding tests on Windows

Patch by Zachary Ware
Close #19403: make contextlib.redirect_stdout reentrant
Issue #19464 Suppress compiler warnings during clean. Patch by Zachary Ware.
Issue #19464 Null merge with 3.3
Issue #6160: The bbox() method of tkinter.Spinbox now returns a tuple of
integers instead of a string.  Based on patch by Guilherme Polo.
Issue #6160: The bbox() method of tkinter.Spinbox now returns a tuple of
integers instead of a string.  Based on patch by Guilherme Polo.