Remove no-longer-used RTE argument of markVarForSelectPriv().

Tom Lane <tgl@sss.pgh.pa.us>

Commit: d4c746516b8b4eb0bf993e3729ccc04d1febdb1e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-02-11T16:23:25Z
Releases: 14.0
Remove no-longer-used RTE argument of markVarForSelectPriv().

In the wake of c028faf2a, this is no longer needed.  I left it
out of that patch since the API change would be undesirable in
a released branch; but there's no reason not to do it in HEAD.

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