pgsql: Allow information schema definitions to work without requiring

Log Message:
-----------
Allow information schema definitions to work without requiring implicit
casts to text.

Modified Files:
--------------
pgsql/src/backend/catalog:
information_schema.sql (r1.41 -> r1.42)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/information_schema.sql.diff?r1=1.41&r2=1.42)