inotify: Add license and copyright headers to meson.build

The copyright from `git log gio/inotify/meson.build` is now included in
the file header. The following commits are too trivial to be
copyrightable:
 - d10be6102f
 - 03e86d000f
 - 1741fc2c6e
 - 8733d172a3

The file was contributed while the `COPYING` file for GLib was
LGPL-2.1-or-later, so was previously implicitly licensed as that.
Let’s make that explicit.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

Helps: #1415

gio/inotify/meson.build

@@ -1,3 +1,24 @@
+# Copyright 2016 Centricular
+# Copyright 2018 Endless Mobile, Inc.
+# Copyright 2022 Collabora, Ltd.
+# Copyright 2023 Eli Schwartz
+# Copyright 2023 Canonical Ltd.
+#
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, see <http://www.gnu.org/licenses/>.
+
 inotify_sources = [
   'inotify-kernel.c',
   'inotify-sub.c',