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

Michael Meskes <meskes@postgresql.org>

Commit: ea0ca75d5d14e0c98782a2188405685af4a475a0
Author: Michael Meskes <meskes@postgresql.org>
Date: 2017-08-14T09:29:34Z
Releases: 10.0
Changed ecpg parser to allow RETURNING clauses without attached C variables.

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