Revert "Skip .DS_Store files in server side utils"

This reverts commit d3fdfdcd1c.
Per failure reports from the buildfarm.

doc/src/sgml/protocol.sgml

@@ -2835,7 +2835,7 @@ The commands accepted in replication mode are:
         <para>
          Files other than regular files and directories, such as symbolic
          links (other than for the directories listed above) and special
-         device and operating system files, are skipped.  (Symbolic links
+         device files, are skipped.  (Symbolic links
          in <filename>pg_tblspc</filename> are maintained.)
         </para>
        </listitem>

doc/src/sgml/ref/pg_basebackup.sgml

@@ -832,8 +832,7 @@ PostgreSQL documentation
    The backup will include all files in the data directory and tablespaces,
    including the configuration files and any additional files placed in the
    directory by third parties, except certain temporary files managed by
-   PostgreSQL and operating system files.  But only regular files and
-   directories are copied, except that
+   PostgreSQL.  But only regular files and directories are copied, except that
    symbolic links used for tablespaces are preserved.  Symbolic links pointing
    to certain directories known to PostgreSQL are copied as empty directories.
    Other symbolic links and special device files are skipped.

doc/src/sgml/ref/pg_rewind.sgml

@@ -374,9 +374,8 @@ GRANT EXECUTE ON function pg_catalog.pg_read_binary_file(text, bigint, bigint, b
       <filename>backup_label</filename>,
       <filename>tablespace_map</filename>,
       <filename>pg_internal.init</filename>,
-      <filename>postmaster.opts</filename>,
-      <filename>postmaster.pid</filename> and
-      <filename>.DS_Store</filename> as well as any file or directory
+      <filename>postmaster.opts</filename>, and
+      <filename>postmaster.pid</filename>, as well as any file or directory
       beginning with <filename>pgsql_tmp</filename>, are omitted.
      </para>
     </step>