Log Message:
-----------
Create temporary files securely.
Modified Files:
--------------
pgsql/contrib/findoidjoins:
make_oidjoins_check (r1.5 -> r1.6)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/findoidjoins/make_oidjoins_check.diff?r1=1.5&r2=1.6)