all: unify format of our Copyright source code commentsth/copyright-comment-cleanup

```bash

readarray -d '' FILES < <(
  git ls-files -z \
    ':(exclude)po' \
    ':(exclude)shared/c-rbtree' \
    ':(exclude)shared/c-list' \
    ':(exclude)shared/c-siphash' \
    ':(exclude)shared/c-stdaux' \
    ':(exclude)shared/n-acd' \
    ':(exclude)shared/n-dhcp4' \
    ':(exclude)src/systemd/src' \
    ':(exclude)shared/systemd/src' \
    ':(exclude)m4' \
    ':(exclude)COPYING*'
  )

sed \
  -e 's/^\(--\|#\| \*\) *\(([cC]) *\)\?Copyright \+\(\(([cC])\) \+\)\?\(\(20\|19\)[0-9][0-9]\) *[-–] *\(\(20\|19\)[0-9][0-9]\) \+\([^ ].*\)$/\1 C1pyright#\5 - \7#\9/' \
  -e 's/^\(--\|#\| \*\) *\(([cC]) *\)\?Copyright \+\(\(([cC])\) \+\)\?\(\(20\|19\)[0-9][0-9]\) *[,] *\(\(20\|19\)[0-9][0-9]\) \+\([^ ].*\)$/\1 C2pyright#\5, \7#\9/' \
  -e 's/^\(--\|#\| \*\) *\(([cC]) *\)\?Copyright \+\(\(([cC])\) \+\)\?\(\(20\|19\)[0-9][0-9]\) \+\([^ ].*\)$/\1 C3pyright#\5#\7/' \
  -e 's/^Copyright \(\(20\|19\)[0-9][0-9]\) \+\([^ ].*\)$/C4pyright#\1#\3/' \
  -i \
  "${FILES[@]}"

echo ">>> untouched Copyright lines"
git grep Copyright "${FILES[@]}"

echo ">>> Copyright lines with unusual extra"
git grep '\<C[0-9]pyright#' "${FILES[@]}" | grep -i reserved

sed \
  -e 's/\<C[0-9]pyright#\([^#]*\)#\(.*\)$/Copyright (C) \1 \2/' \
  -i \
  "${FILES[@]}"

```

1 files changed, 2 insertions, 2 deletions

diff --git a/contrib/scripts/checkpatch.pl b/contrib/scripts/checkpatch.pl
index 5b402f1b30..bf1ccb1ccc 100755
--- a/contrib/scripts/checkpatch.pl
+++ b/contrib/scripts/checkpatch.pl
@@ -1,7 +1,7 @@
 #!/usr/bin/perl -n
 # SPDX-License-Identifier: GPL-2.0+
 #
-# Copyright 2018 Red Hat, Inc.
+# Copyright (C) 2018 Red Hat, Inc.
 #
 
 # $ perldoc checkpatch.pl for eye-pleasing view of the manual:
@@ -298,7 +298,7 @@ F<CONTRIBUTING>
 
 =head1 COPYRIGHT
 
-Copyright 2018 Red Hat
+Copyright (C) 2018 Red Hat
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by