Rearrange bufmgr header files so that buf_internals.h need not be

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 680b7357ce850c28d06997be793aee18f72434ba
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2000-11-30T01:39:08Z
Releases: 7.1.1
Rearrange bufmgr header files so that buf_internals.h need not be
included by everything that includes bufmgr.h --- it's supposed to be
internals, after all, not part of the API!  This fixes the conflict
against FreeBSD headers reported by Rosenman, by making it unnecessary
for s_lock.h to be included by plperl.c.

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