[gnome-software/wip/william/cherry-pick] Use GLib i18n macro

[William Hua <williamhua src gnome org>]

commit e086260def225d6d66d375a67b1afcd5b1ac9a32
Author: William Hua <william hua canonical com>
Date:   Tue Feb 9 15:22:26 2016 -0500

    Use GLib i18n macro

 src/plugins/ubuntu-login-dialog.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/src/plugins/ubuntu-login-dialog.c b/src/plugins/ubuntu-login-dialog.c
index ab8723b..747a10c 100644
--- a/src/plugins/ubuntu-login-dialog.c
+++ b/src/plugins/ubuntu-login-dialog.c
@@ -1,11 +1,9 @@
 #include "ubuntu-login-dialog.h"
 
+#include <glib/gi18n.h>
 #include <json-glib/json-glib.h>
 #include <libsoup/soup.h>
 
-/* XXX */
-#define _(x) (x)
-
 #define UBUNTU_LOGIN_HOST "https://login.ubuntu.com";
 
 struct _UbuntuLoginDialog