pgsql: Skip .DS_Store files in server side utils

Skip .DS_Store files in server side utils

The macOS Finder application creates .DS_Store files in directories
when opened,  which creates problems for serverside utilities which
expect all files to be PostgreSQL specific files.  Skip these files
when encountered in pg_checksums, pg_rewind and pg_basebackup.

This was extracted from a larger patchset for skipping hidden files
and system files, where the concencus was to just skip these. Since
this is equally likely to happen in every version, backpatch to all
supported versions.

Reported-by: Mark Guertin <markguertin@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Tobias Bussmann <t.bussmann@gmx.net>
Discussion: https://postgr.es/m/E258CE50-AB0E-455D-8AAD-BB4FE8F882FB@gmail.com
Backpatch-through: v12

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/d3fdfdcd1c7f1b714a9a85b893d2c5afc60bea91

Modified Files
--------------
doc/src/sgml/protocol.sgml                   |  2 +-
doc/src/sgml/ref/pg_basebackup.sgml          |  3 ++-
doc/src/sgml/ref/pg_rewind.sgml              |  5 +++--
src/backend/replication/basebackup.c         |  4 ++++
src/bin/pg_basebackup/t/010_pg_basebackup.pl | 16 ++++++++++++++++
src/bin/pg_checksums/pg_checksums.c          |  4 ++++
src/bin/pg_checksums/t/002_actions.pl        |  7 +++++++
src/bin/pg_rewind/filemap.c                  |  4 ++++
src/bin/pg_rewind/t/003_extrafiles.pl        |  5 +++++
9 files changed, 46 insertions(+), 4 deletions(-)