Remove some pre-WAL relics:

Bruce Momjian <bruce@momjian.us>

Commit: 918e864f145583a314b0a5c3674290fcd46ea3f9
Author: Bruce Momjian <bruce@momjian.us>
Date: 2002-06-15T19:55:38Z
Releases: 7.3.1
Remove some pre-WAL relics:
  SharedBufferChanged
  BufferRelidLastDirtied
  BufferTagLastDirtied
  BufferDirtiedByMe

Manfred Koizar

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