9.2 fix: spclocation is gone

pg_tablespace.spclocation column is gone in PostgreSQL 9.2. It's been
replaced by pg_tablespace_location(oid) function. Attached is a patch to
fix a query used by pgAdmin accordingly.

(this started to get on my nerve, as the query is executed every time
you connect to a database..)

--
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com