Mark a few 'bbsink' related functions / variables static.

Andres Freund <andres@anarazel.de>

Commit: b5f44225b833a2fd07b4a7c77e33ae0c37e6a7d6
Author: Andres Freund <andres@anarazel.de>
Date: 2022-05-12T16:11:31Z
Releases: 15.0
Mark a few 'bbsink' related functions / variables static.

Discussion: https://postgr.es/m/20220506234924.6mxxotl3xl63db3l@alap3.anarazel.de

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