gh-155445: Fix the calculation of constant HAVE_GETVALUE in test._test_multiprocessing.

[YvesDup]

Fix the calculation of this constant getting the value from flags dictionary if it is present in the attributes of _multiprocessing module.

try:
    HAVE_GETVALUE = not getattr(_multiprocessing,'flags') \
                            .get('HAVE_BROKEN_SEM_GETVALUE', False)
except:
    HAVE_GETVALUE = True

Reactivate the second part of test_bounded_semaphore test.

cpython/Lib/test/_test_multiprocessing.py

Lines 1751 to 1758 in 6f7fb6c

	def test_bounded_semaphore(self):
	sem = self.BoundedSemaphore(2)
	self._test_semaphore(sem)
	# Currently fails on OS/X
	#if HAVE_GETVALUE:
	# self.assertRaises(ValueError, sem.release)
	# self.assertReturnsIfImplemented(2, get_value, sem)

• Issue: In test._test_multiprocessing file, HAVE_GETVALUE constant is always False #155445