pgsql: Fix inline_set_returning_function() to allow multiple OUT parame

Fix inline_set_returning_function() to allow multiple OUT parameters.

inline_set_returning_function failed to distinguish functions returning
generic RECORD (which require a column list in the RTE, as well as run-time
type checking) from those with multiple OUT parameters (which do not).
This prevented inlining from happening.  Per complaint from Jay Levitt.
Back-patch to 8.4 where this capability was introduced.

Branch
------
REL8_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/9fc28fb5ea16c7f335aba052a2c31bbd03932f09

Modified Files
--------------
src/backend/optimizer/util/clauses.c |    6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)