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

Michael Meskes <meskes@postgresql.org>

Commit: f2ed2d0a12bede8e6d91b3acc8f6100be3927990
Author: Michael Meskes <meskes@postgresql.org>
Date: 2017-08-16T11:28:37Z
Releases: 9.5.9
Changed ecpg parser to allow RETURNING clauses without attached C variables.

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