Unused function arguments

While reading the logical replication (and related) code, I found a few unused
function arguments:
 * XactLogCommitRecord() - unused argument forceSync
 * SnapBuildBuildSnapshot() - xid
 * TeardownHistoricSnapshot() - is_error

No idea which ones are intended for future use and which ones can be
removed.

--
Antonin Houska
Cybertec Schönig & Schönig GmbH
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Web: http://www.postgresql-support.de, http://www.cybertec.at