[pushed] [gdb/testsuite] Add missing copyright notice in tclint-plugin.py

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

I ran:
...
$ ./gdb/contrib/license-check-new-files.sh -s gdb-17-branchpoint HEAD
Scanning directories gdb*/...
gdb/features/aarch64-fpmr.c: None
gdb/features/aarch64-fpmr.xml: FSFAP-no-warranty-disclaimer
gdb/syscalls/riscv-linux.xml: FSFAP
gdb/syscalls/riscv-linux.xml.in: FSFAP-no-warranty-disclaimer
gdb/testsuite/tclint-plugin.py: None
gdbsupport/unordered_dense/stl.h: MIT
...
and found out that I forgot to add a copyright notice to
gdb/testsuite/tclint-plugin.py.

Fix this by adding a copyright notice.
---
 gdb/testsuite/tclint-plugin.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/gdb/testsuite/tclint-plugin.py b/gdb/testsuite/tclint-plugin.py
index 24a813a497c..5a09397c3a7 100644
--- a/gdb/testsuite/tclint-plugin.py
+++ b/gdb/testsuite/tclint-plugin.py
@@ -1,3 +1,18 @@
+# Copyright (C) 2025-2026 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/>.
+
 from tclint.commands.checks import (
     CommandArgError,
 )

base-commit: 3a5657bd3f26111214e70d3882150b06c9e45dff
-- 
2.51.0