In `test._test_multiprocessing` file, `HAVE_GETVALUE` constant is always `False`

[YvesDup]

Bug report

Bug description:

In the test._test_multprocessing, the HAVE_GETVALUE constant is always False because the HAVE_BROKEN_SEM_GETVALUE value does not exist in _multiprocessingmodule.

cpython/Lib/test/_test_multiprocessing.py

Lines 141 to 142 in 6f7fb6c

	HAVE_GETVALUE = not getattr(_multiprocessing,
	'HAVE_BROKEN_SEM_GETVALUE', False)

On macOS, this value exists only in the flagsdict of _multiprocessing.

>>> import _mulitpocessing
>>> vars(_multiprocessing)
{'__name__': '_multiprocessing', '__doc__': None, '__package__': '', 
'__loader__':  ............ ,
.......
'SemLock': <class '_multiprocessing.SemLock'>,
'flags': {'HAVE_SEM_OPEN': 1, 'HAVE_BROKEN_SEM_GETVALUE': 1}}

Fix is easy and will permit to reactivate the second part of test_bounded_semaphore test.

cpython/Lib/test/_test_multiprocessing.py

Lines 1755 to 1757 in 6f7fb6c

	#if HAVE_GETVALUE:
	# self.assertRaises(ValueError, sem.release)
	# self.assertReturnsIfImplemented(2, get_value, sem)

A new PR will be submitted soon.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS, Linux