pgsql: Add missing handling of PlannedStmt.transientPlan in

Log Message:
-----------
Add missing handling of PlannedStmt.transientPlan in copyfuncs/outfuncs.

_outPlannedStmt is only debug support, so the omission there was not very
serious, but the omission in _copyPlannedStmt is a real bug.  The consequence
would be that a copied plan tree would never be marked as a transient plan,
so that we would forget we ought to replan it after some not-yet-ready index
becomes ready for use.  This might explain some past complaints about indexes
created with CREATE INDEX CONCURRENTLY not being used right away.  Problem
spotted by Yeb Havinga.

Back-patch to 8.3, where the field was added.

Modified Files:
--------------
    pgsql/src/backend/nodes:
        copyfuncs.c (r1.467 -> r1.468)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c?r1=1.467&r2=1.468)
        outfuncs.c (r1.388 -> r1.389)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c?r1=1.388&r2=1.389)