[3.13] gh-130932: cwd cannot be removed on Solaris/Illumos (GH-131037) (#131073)

gh-130932: cwd cannot be removed on Solaris/Illumos (GH-131037)
(cherry picked from commit 69309a5)

Co-authored-by: Jakub Kulík <[email protected]>

Author: miss-islington

Lib/test/test_import/__init__.py

@@ -1204,6 +1204,7 @@ class substr(str):
                 self.assertRegex(line, rb"cannot import name 'Fraction' from 'fractions' \(.*\)")
 
     @unittest.skipIf(sys.platform == 'win32', 'Cannot delete cwd on Windows')
+    @unittest.skipIf(sys.platform == 'sunos5', 'Cannot delete cwd on Solaris/Illumos')
     def test_script_shadowing_stdlib_cwd_failure(self):
         with os_helper.temp_dir() as tmp:
             subtmp = os.path.join(tmp, "subtmp")