Modernize some for loops

Peter Eisentraut <peter@eisentraut.org>

Commit: 1a795188889cc630f4f9ce617bfc28fb2aa1432f
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2025-10-15T08:00:37Z
Modernize some for loops

in guc-related source files, in anticipation of some further
restructuring.

Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/8fdfb91e-60fb-44fa-8df6-f5dea47353c9@eisentraut.org

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