pgsql: Remove reference to contrib/mac, which isn't there anymore.
Log Message:
-----------
Remove reference to contrib/mac, which isn't there anymore.
Modified Files:
--------------
pgsql/doc/src/sgml:
datatype.sgml (r1.172 -> r1.173)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/datatype.sgml.diff?r1=1.172&r2=1.173)