Update types in smgr API

Peter Eisentraut <peter@eisentraut.org>

Commit: b9f0e54bc955ba3f6187d238b03c9c99c576a6af
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2023-02-27T06:47:46Z
Releases: 16.0
Update types in smgr API

Change data buffer to void *, from char *, and add const where
appropriate.  This makes it match the File API (see also
2d4f1ba6cfc2f0a977f1c30bda9848041343e248) and stdio.

Discussion: https://www.postgresql.org/message-id/flat/11dda853-bb5b-59ba-a746-e168b1ce4bdb%40enterprisedb.com

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