Changed ecpg parser to allow RETURNING clauses without attached C variables.

Michael Meskes <meskes@postgresql.org>

Commit: 60b135c8262bd7d1d115de1797165a437a890a7a
Author: Michael Meskes <meskes@postgresql.org>
Date: 2017-08-16T11:30:20Z
Releases: 9.2.23
Changed ecpg parser to allow RETURNING clauses without attached C variables.

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