[gnome-panel] configure.ac: add gmodule-2.0 to libgnome-panel dependencies

[Alberts Muktupāvels <muktupavels src gnome org>]

commit f07c0d9a57af96c08704ba39a72b701d39c730fd
Author: Dmitry Shachnev <mitya57 gmail com>
Date:   Mon Mar 26 22:32:51 2018 +0300

    configure.ac: add gmodule-2.0 to libgnome-panel dependencies

 configure.ac | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/configure.ac b/configure.ac
index 885a58af1..4c0656991 100644
--- a/configure.ac
+++ b/configure.ac
@@ -147,6 +147,7 @@ PKG_CHECK_MODULES([PANEL], [
 
 PKG_CHECK_MODULES([LIBGNOME_PANEL], [
   gio-2.0 >= $GLIB_REQUIRED
+  gmodule-2.0 >= $GLIB_REQUIRED
   gtk+-3.0 >= $GTK_REQUIRED
 ])