Put back bufmgr.h in bufpage.h -- it is needed by some macros.

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

Commit: 9084399782042c9d0d3230e80ccd74850bb96b71
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2008-05-12T16:06:10Z
Releases: 8.4.0
Put back bufmgr.h in bufpage.h -- it is needed by some macros.

Remove #include bufmgr.h from (most?) source files which already include
bufpage.h.

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