Remove more unreferenced function declarations

Michael Paquier <michael@paquier.xyz>

Commit: d1a040543b49e0aad273e7766cd7e2fcf2b781fa
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-07-07T00:58:33Z
Releases: 13.0
Remove more unreferenced function declarations

Author: Masahiko Sawada
Discussion: https://postgr.es/m/CAD21AoDuAYsRb3Q9aobkFZ6DZMWxsyg4HOmgkwgeWNfSkTwGxw@mail.gmail.com

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