[gnome-control-center/night-strings-translate] Include glib/gi18n.h which is needed for gettext

[Sebastien Bacher <sbacher src gnome org>]

commit 8541ef9e462ca1ee0e0ea481314206a095b606ad
Author: Sebastien Bacher <seb128 ubuntu com>
Date:   Wed Apr 10 11:27:14 2019 +0200

    Include glib/gi18n.h which is needed for gettext

 panels/display/cc-night-light-dialog.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/panels/display/cc-night-light-dialog.c b/panels/display/cc-night-light-dialog.c
index c1d6b039b..906815537 100644
--- a/panels/display/cc-night-light-dialog.c
+++ b/panels/display/cc-night-light-dialog.c
@@ -22,6 +22,7 @@
 
 #include <gdesktop-enums.h>
 #include <gtk/gtk.h>
+#include <glib/gi18n.h>
 #include <math.h>
 
 #include "cc-night-light-dialog.h"