pgsql: Add missing handling of PlannedStmt.transientPlan in

Log Message:
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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.

Tags:
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REL8_3_STABLE

Modified Files:
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    pgsql/src/backend/nodes:
        copyfuncs.c (r1.388.2.1 -> r1.388.2.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c?r1=1.388.2.1&r2=1.388.2.2)
        outfuncs.c (r1.322.2.2 -> r1.322.2.3)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c?r1=1.322.2.2&r2=1.322.2.3)