test_site: test_underpth_basic() fails if the current directory is non-ASCII

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Failure on GHA Windows x64 CI with PR #109229 which runs test_site in a non-ASCII working directory:

FAIL: test_underpth_basic (test.test_site._pthFileTests.test_underpth_basic)
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Traceback (most recent call last):
 File "D:\a\cpython\cpython\Lib\test\test_site.py", line 621, in test_underpth_basic
 self.assertEqual(
AssertionError: Lists differ: ['D:\[40 chars]_1460\udce6', 'D:\\a\\cpython\\cpython\\PCbuil[396 chars]18f'] != ['D:\[40 chars]_1460�', 'D:\\a\\cpython\\cpython\\PCbuild\\am[391 chars]18f']

First differing element 0:
'D:\\a\\cpython\\cpython\\build\\test_python_1460\udce6'
'D:\\a\\cpython\\cpython\\build\\test_python_1460�'

Diff is 690 characters long. Set self.maxDiff to None to see it. : sys.path is incorrect

build: https://github.com/python/cpython/actions/runs/6138224249/job/16654899364?pr=109229

Linked PRs

• gh-109237: Fix test_site for non-ASCII working directory #109238
• [3.12] gh-109237: Fix test_site for non-ASCII working directory (GH-109238) #109239
• [3.11] gh-109237: Fix test_site for non-ASCII working directory (GH-109238) #109240

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Example:

vstinner@WIN C:\victor\python\main>mkdir héhé

vstinner@WIN C:\victor\python\main>cd héhé

vstinner@WIN C:\victor\python\main\héhé>..\python -m test test_site -v
(...)
======================================================================
FAIL: test_underpth_basic (test.test_site._pthFileTests.test_underpth_basic)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "C:\victor\python\main\Lib\test\test_site.py", line 621, in test_underpth_basic
 self.assertEqual(
AssertionError: Lists differ: ['C:\[19 chars]in\\h\udce9h\udce9', 'C:\\victor\\python\\main[361 chars]emp'] != ['C:\[19 chars]in\\héhé', 'C:\\victor\\python\\main\\PCbuild\[351 chars]emp']

First differing element 0:
'C:\\victor\\python\\main\\h\udce9h\udce9'
'C:\\victor\\python\\main\\héhé'

- ['C:\\victor\\python\\main\\h\udce9h\udce9',
? ^^^^^^ ^^^^^^

+ ['C:\\victor\\python\\main\\héhé',
? ^ ^

 'C:\\victor\\python\\main\\PCbuild\\amd64\\python313_d.zip',
 'C:\\victor\\python\\main\\PCbuild\\amd64',
 'C:\\victor\\python\\main\\Lib',
 'C:\\Users\\vstinner\\AppData\\Roaming\\Python\\Python313\\site-packages',
 'C:\\victor\\python\\main',
 'C:\\victor\\python\\main\\Lib\\site-packages',
 'C:\\Users\\vstinner\\AppData\\Local\\Temp\\tmpesrsy5ed',
 'C:\\Users\\vstinner\\AppData\\Local\\Temp'] : sys.path is incorrect

----------------------------------------------------------------------
Ran 32 tests in 2.619s

FAILED (failures=1, skipped=2)
(...)