pythongh-116622: Skip PosixPathTest.test_expanduser_pwd2 on platforms…

… which don't support pwd.getpwall (pythonGH-122521)

(cherry picked from commit 8844197)

Co-authored-by: Malcolm Smith <[email protected]>

Lib/test/test_posixpath.py

@@ -5,7 +5,7 @@
 import unittest
 from posixpath import realpath, abspath, dirname, basename
 from test import test_genericpath
-from test.support import import_helper
+from test.support import get_attribute, import_helper
 from test.support import cpython_only, os_helper
 from test.support.os_helper import FakePath
 from unittest import mock
@@ -359,7 +359,7 @@ def test_expanduser_pwd(self):
                      "no home directory on VxWorks")
     def test_expanduser_pwd2(self):
         pwd = import_helper.import_module('pwd')
-        for all_entry in pwd.getpwall():
+        for all_entry in get_attribute(pwd, 'getpwall')():
             name = all_entry.pw_name
 
             # gh-121200: pw_dir can be different between getpwall() and