[vte] widget: Add gtk glue

[Christian Persch <chpe src gnome org>]

commit 7b896c47b85a4919e1466766bf49bd73821d0c0a
Author: Christian Persch <chpe src gnome org>
Date:   Wed Dec 2 16:35:26 2020 +0100

    widget: Add gtk glue

 src/gtk-glue.hh | 30 ++++++++++++++++++++++++++++++
 src/meson.build |  6 +++++-
 2 files changed, 35 insertions(+), 1 deletion(-)
---
diff --git a/src/gtk-glue.hh b/src/gtk-glue.hh
new file mode 100644
index 00000000..9a2e2959
--- /dev/null
+++ b/src/gtk-glue.hh
@@ -0,0 +1,30 @@
+/*
+ * Copyright © 2020 Christian Persch
+ *
+ * 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 3 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 General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "std-glue.hh"
+
+namespace vte::gtk {
+
+} // namespace vte::gtk
+
+namespace vte {
+
+VTE_DECLARE_FREEABLE(GtkTargetList, gtk_target_list_unref);
+
+} // namespace vte
diff --git a/src/meson.build b/src/meson.build
index d0ea6794..208e93a0 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -32,6 +32,10 @@ glib_glue_sources = files(
   'glib-glue.hh',
 )
 
+gtk_glue_sources = files(
+  'gtk-glue.hh',
+)
+
 icu_sources = files(
   'icu-converter.cc',
   'icu-converter.hh',
@@ -135,7 +139,7 @@ utf8_sources = files(
   'utf8.hh',
 )
 
-libvte_common_sources = config_sources + debug_sources + glib_glue_sources + libc_glue_sources + 
modes_sources + pango_glue_sources + parser_sources + pcre2_glue_sources + pty_sources + refptr_sources + 
regex_sources + std_glue_sources + utf8_sources + files(
+libvte_common_sources = config_sources + debug_sources + glib_glue_sources + gtk_glue_sources + 
libc_glue_sources + modes_sources + pango_glue_sources + parser_sources + pcre2_glue_sources + pty_sources + 
refptr_sources + regex_sources + std_glue_sources + utf8_sources + files(
   'attr.hh',
   'bidi.cc',
   'bidi.hh',