bpo-28655: Fix test_import.test_missing_source_legacy() (GH-9589)

bpo-28655: Fix test_import.test_missing_source_legacy() (GH-9589) · python/cpython@43500a5

Original file line number	Diff line number	Diff line change
`@@ -779,8 +779,11 @@ def test_missing_source_legacy(self):`
`779`	`779`	`unload(TESTFN)`
`780`	`780`	`importlib.invalidate_caches()`
`781`	`781`	`m = __import__(TESTFN)`
`782`		`-self.assertEqual(m.__file__,`
`783`		`-os.path.join(os.curdir, os.path.relpath(pyc_file)))`
	`782`	`+try:`
	`783`	`+self.assertEqual(m.__file__,`
	`784`	`+os.path.join(os.curdir, os.path.relpath(pyc_file)))`
	`785`	`+finally:`
	`786`	`+os.remove(pyc_file)`
`784`	`787`
`785`	`788`	`def test___cached__(self):`
`786`	`789`	`# Modules now also have an __cached__ that points to the pyc file.`