[devhelp] Licenses: Add copyrights and SPDX license header to src/*.{ui, xml, build}

[Sébastien Wilmet <swilmet src gnome org>]

commit acced210242bebff069fd57730eaeca1a795b34d
Author: Ayman Bagabas <ayman bagabas gmail com>
Date:   Fri Dec 20 09:51:34 2019 -0500

    Licenses: Add copyrights and SPDX license header to src/*.{ui,xml,build}
    
    Follow the REUSE specifications to apply licenses https://reuse.software/
    
    https://gitlab.gnome.org/GNOME/devhelp/issues/15

 src/dh-assistant.ui   |  5 +++++
 src/dh-preferences.ui | 20 +++-----------------
 src/dh.gresource.xml  |  8 ++++++++
 src/meson.build       |  3 +++
 4 files changed, 19 insertions(+), 17 deletions(-)
---
diff --git a/src/dh-assistant.ui b/src/dh-assistant.ui
index 7c038d82..f5ca0a76 100644
--- a/src/dh-assistant.ui
+++ b/src/dh-assistant.ui
@@ -1,4 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+  SPDX-FileCopyrightText: 2013 Ignacio Casal Quinteiro <ignacio casal nice-software com>
+  SPDX-FileCopyrightText: 2018 Sébastien Wilmet <swilmet gnome org>
+  SPDX-License-Identifier: GPL-3.0-or-later
+-->
 <interface>
   <!-- interface-requires gtk+ 3.8 -->
   <template class="DhAssistant" parent="GtkApplicationWindow">
diff --git a/src/dh-preferences.ui b/src/dh-preferences.ui
index 3d4609ac..050b36c6 100644
--- a/src/dh-preferences.ui
+++ b/src/dh-preferences.ui
@@ -1,23 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Generated with glade 3.18.3 -->
 <!--
-  This file is part of Devhelp.
-
-  Copyright (C) 2010 Imendio AB
-  Copyright (C) 2012 Aleksander Morgado <aleksander gnu org>
-
-  Devhelp 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.
-
-  Devhelp 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 Devhelp.  If not, see <http://www.gnu.org/licenses/>.
+  SPDX-FileCopyrightText: 2010 Imendio AB
+  SPDX-FileCopyrightText: 2012 Aleksander Morgado <aleksander gnu org>
+  SPDX-License-Identifier: GPL-3.0-or-later
 -->
 <interface>
   <requires lib="gtk+" version="3.12"/>
diff --git a/src/dh.gresource.xml b/src/dh.gresource.xml
index c063d879..78fda590 100644
--- a/src/dh.gresource.xml
+++ b/src/dh.gresource.xml
@@ -1,4 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+  SPDX-FileCopyrightText: 2013 Thomas Bechtold <thomasbechtold jpberlin de>
+  SPDX-FileCopyrightText: 2013 Ignacio Casal Quinteiro <ignacio casal nice-software com>
+  SPDX-FileCopyrightText: 2016 Frédéric Péters <fpeters 0d be>
+  SPDX-FileCopyrightText: 2018 Günther Wagner <info gunibert de>
+  SPDX-FileCopyrightText: 2018 Sébastien Wilmet <swilmet gnome org>
+  SPDX-License-Identifier: GPL-3.0-or-later
+-->
 <gresources>
   <gresource prefix="/org/gnome/devhelp">
     <file preprocess="xml-stripblanks">dh-assistant.ui</file>
diff --git a/src/meson.build b/src/meson.build
index d8b58179..fbf67e49 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2018 Sébastien Wilmet <swilmet gnome org>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 devhelp_app_sources = [
   'dh-app.c',
   'dh-assistant.c',