Add a new FCNTL.py backward compatibility module that issues a deprecation

warning.  This is similar to the TERMIOS backward compatbility module.

Lib/FCNTL.py

+"""Backward-compatibility version of FCNTL; export constants exported by
+fcntl, and issue a deprecation warning.
+"""
+
+import warnings
+warnings.warn("the FCNTL module is deprecated; please use fcntl",
+              DeprecationWarning)
+
+
+# Export the constants known to the fcntl module:
+from fcntl import *
+
+# and *only* the constants:
+__all__ = [s for s in dir() if s[0] in "ABCDEFGHIJKLMNOPQRSTUVWXYZ"]