[pushed] [gdb/contrib] Add missing copyright notice in check-copies.py

[Tom de Vries <tdevries@suse.de>]

I ran:
...
$ gdb/contrib/license-check-new-files.py -s gdb-18-branchpoint HEAD
...
and noticed that gdb/contrib/check-copies.py is missing a copyright notice.

Add this.
---
 gdb/contrib/check-copies.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gdb/contrib/check-copies.py b/gdb/contrib/check-copies.py
index 11c226bb9d2..9450ddf6c1a 100755
--- a/gdb/contrib/check-copies.py
+++ b/gdb/contrib/check-copies.py
@@ -1,5 +1,19 @@
 #! /usr/bin/env python3
 
+# Copyright (C) 2026 Free Software Foundation, Inc.
+# 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
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 import subprocess
 import sys
 from itertools import chain

base-commit: 40b3fffeddabbb19d1db55737231dd5438b26240
-- 
2.51.0