Avoid non-constant format string argument to fprintf().

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: aecefffc3f8041c883ab4fb035cf0d5519b5a7ed
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2020-08-18T10:13:28Z
Releases: 12.5
Avoid non-constant format string argument to fprintf().

As Tom Lane pointed out, it could defeat the compiler's printf() format
string verification.

Backpatch to v12, like that patch that introduced it.

Discussion: https://www.postgresql.org/message-id/1069283.1597672779%40sss.pgh.pa.us

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