Issue #5113: Fix a test_posix failure on HP-UX, where non-root users can

chown() to root under certain circumstances.

diff --cc Lib/test/test_posix.py
index c3dfffb1784537ededc59febe193f34f48580c84,76126342085f191a0c3775812766f0428fe1f25a..142dddd09b6238e4a304a7f5c393c62c627cddb6
--- 1/Lib/test/test_posix.py
--- 2/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@@ -9,7 -9,7 +9,8 @@@ import errn
  import sys
  import time
  import os
 +import fcntl
+ import platform
  import pwd
  import shutil
  import stat