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

Michael Meskes <meskes@postgresql.org>

Commit: f8bc6b2f689dc721c753949854bfe605f33149ca
Author: Michael Meskes <meskes@postgresql.org>
Date: 2017-08-16T11:30:09Z
Releases: 9.3.19
Changed ecpg parser to allow RETURNING clauses without attached C variables.

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