Add some const qualifiers

Peter Eisentraut <peter@eisentraut.org>

Commit: 64b787656de6c0c6f8f2e6e5b8a3cea25b92458b
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2023-09-26T10:28:57Z
Releases: 17.0
Add some const qualifiers

There was a mismatch between the const qualifiers for
excludeDirContents in src/backend/backup/basebackup.c and
src/bin/pg_rewind/filemap.c, which led to a quick search for similar
cases.  We should make excludeDirContents match, but the rest of the
changes seem like a good idea as well.

Author: David Steele <david@pgmasters.net>
Discussion: https://www.postgresql.org/message-id/flat/669a035c-d23d-2f38-7ff0-0cb93e01d610@pgmasters.net

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