Log Message:
-----------
Move undef of rename/unlink so system declarations are unmodified.
Modified Files:
--------------
pgsql-server/src/port:
dirmod.c (r1.24 -> r1.25)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/port/dirmod.c.diff?r1=1.24&r2=1.25)