test_sysconfig.test_user_similar fails on --disable-gil --with-platlibdir=lib64

[hroncok]

Bug report

Bug description:

$ /configure --config-cache --without-ensurepip --with-pydebug --disable-gil --with-platlibdir=lib64 && make
...
$ ./python -m test test_sysconfig
Using random seed: 1721645515
0:00:00 load avg: 1.40 Run 1 test sequentially in a single process
0:00:00 load avg: 1.40 [1/1] test_sysconfig
test test_sysconfig failed -- Traceback (most recent call last):
  File ".../cpython/Lib/test/test_sysconfig.py", line 424, in test_user_similar
    self.assertEqual(user_path, expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
AssertionError: '/home/.../.local/lib/python3.14t/site-packages' != '/home/.../.local/lib64/python3.14t/site-packages'
- /home/.../.local/lib/python3.14t/site-packages
+ /home/.../.local/lib64/python3.14t/site-packages
?                     ++


test_sysconfig failed (1 failure)

== Tests result: FAILURE ==

1 test failed:
    test_sysconfig

Total duration: 248 ms
Total tests: run=27 failures=1 skipped=3
Total test files: run=1/1 failed=1
Result: FAILURE

CPython versions tested on:

3.13, CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-122014: Account with abi_thread in test_sysconfig.test_user_similar (#122014) #122017
• [3.13] gh-122014: Account for abi_thread in test_sysconfig.test_user_similar (gh-122017) #122039

[hroncok]

I believe the code in the tests makes assumptions about the scheme and the t in here makes the tests fail:

cpython/Lib/test/test_sysconfig.py

Lines 417 to 423 in 1a0c7b9

	if name == 'platlib':
	# Replace "/lib64/python3.11/site-packages" suffix
	# with "/lib/python3.11/site-packages".
	py_version_short = sysconfig.get_python_version()
	suffix = f'python{py_version_short}/site-packages'
	expected = expected.replace(f'/{sys.platlibdir}/{suffix}',
	f'/lib/{suffix}')