Add 'static' to file-local variables missing it.

Andres Freund <andres@anarazel.de>

Commit: 09cd33f47bb32f904c32b5aabe607a5125159cc4
Author: Andres Freund <andres@anarazel.de>
Date: 2022-05-12T19:39:33Z
Releases: 15.0
Add 'static' to file-local variables missing it.

Noticed when comparing the set of exported symbols without / with
-fvisibility=hidden after adding PGDLLIMPORT to intentionally exported
symbols.

Discussion: https://postgr.es/m/20220512164513.vaheofqp2q24l65r@alap3.anarazel.de

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