Avoid unnecessary public struct declaration in slru.h

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 55573990cac93d9f17a5c3ef19946415f8244903
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2010-12-30T15:09:17Z
Releases: 9.1.0
Avoid unnecessary public struct declaration in slru.h

Instead, declare a public wrapper of the sole function using it for
external callers, so that they don't have to always pass a NULL
argument.

Author: Kevin Grittner

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