When Python is configured to use 'lib64' for sys.platlibdir, test_sysconfig fails:

$ ./configure --with-platlibdir=lib64
$ make
$ ./python -m test -v test_sysconfig 

======================================================================
FAIL: test_user_similar (test.test_sysconfig.TestSysConfig)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/vstinner/python/main/Lib/test/test_sysconfig.py", line 299, in test_user_similar
    self.assertEqual(user_path, global_path.replace(base, user, 1))
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '/home/vstinner/.local/lib/python3.11/site-packages' != '/home/vstinner/.local/lib64/python3.11/site-packages'
- /home/vstinner/.local/lib/python3.11/site-packages
+ /home/vstinner/.local/lib64/python3.11/site-packages
?                          ++