python - lo: Don't del make_option.

Log Message:
-----------
Don't del make_option.

Could be useful as a reference point for option extenders.

Modified Files:
--------------
lo/postgresql/utility/client:
option.py (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/lo/postgresql/utility/client/option.py.diff?r1=1.8&r2=1.9)