Log Message:
-----------
Spell __darwin__ correctly, to suppress compiler warning on OSX.
Modified Files:
--------------
pgsql/contrib/pg_upgrade:
file.c (r1.5 -> r1.6)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_upgrade/file.c?r1=1.5&r2=1.6)