bpo-45653: fix test_embed on windows (GH-29814)

bpo-45653: fix test_embed on windows (GH-29814) · python/cpython@02b5ac6

Original file line number	Diff line number	Diff line change
`@@ -65,7 +65,7 @@ def setUp(self):`
`65`	`65`	`ext = ("_d" if debug_build(sys.executable) else "") + ".exe"`
`66`	`66`	`exename += ext`
`67`	`67`	`exepath = builddir`
`68`		`-expecteddir = support.REPO_ROOT`
	`68`	`+expecteddir = os.path.join(support.REPO_ROOT, builddir)`
`69`	`69`	`else:`
`70`	`70`	`exepath = os.path.join(builddir, 'Programs')`
`71`	`71`	`expecteddir = os.path.join(support.REPO_ROOT, 'Programs')`