skip a fcntl test on ARM Linux that isn't supported there.

diff --cc Lib/test/test_fcntl.py
index f977187fec1b24cb8bc9b0ca25d7e6bc87cfb567,09cb047298e8d359de9b478aaf01239f9ca7c547..9dd887ab1a5f4d00f9d2c261c849f5389610fc9e
--- 1/Lib/test/test_fcntl.py
--- 2/Lib/test/test_fcntl.py
+++ b/Lib/test/test_fcntl.py
@@@ -1,5 -1,9 +1,6 @@@
  """Test program for the fcntl C module.
 -
 -OS/2+EMX doesn't support the file locking operations.
 -
  """
+ import platform
  import os
  import struct
  import sys