Add missing 'extern' to function prototypes.

Andres Freund <andres@anarazel.de>

Commit: 905c020bef99e16b37529203084cd93932e73805
Author: Andres Freund <andres@anarazel.de>
Date: 2022-05-12T19:39:33Z
Releases: 15.0
Add missing 'extern' to function prototypes.

Postgres style is to spell out extern. Noticed while scripting adding
PGDLLIMPORT markers to functions.

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

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