[gnome-flashback] idle-monitor: fix build warnings

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 474426dfa01b28de997e133a02a778c49b537074
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Fri Jul 10 20:51:19 2015 +0300

    idle-monitor: fix build warnings

 .../libidle-monitor/flashback-idle-monitor.c       |    1 +
 gnome-flashback/libidle-monitor/meta-backend.c     |    4 ++--
 .../libidle-monitor/meta-idle-monitor.c            |    2 --
 3 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/gnome-flashback/libidle-monitor/flashback-idle-monitor.c 
b/gnome-flashback/libidle-monitor/flashback-idle-monitor.c
index 0ae6fce..77cc37c 100644
--- a/gnome-flashback/libidle-monitor/flashback-idle-monitor.c
+++ b/gnome-flashback/libidle-monitor/flashback-idle-monitor.c
@@ -28,6 +28,7 @@
 #include "flashback-idle-monitor.h"
 #include "meta-backend.h"
 #include "meta-idle-monitor.h"
+#include "meta-idle-monitor-xsync.h"
 #include "meta-dbus-idle-monitor.h"
 
 struct _FlashbackIdleMonitor
diff --git a/gnome-flashback/libidle-monitor/meta-backend.c b/gnome-flashback/libidle-monitor/meta-backend.c
index d7ed2fd..3a0fced 100644
--- a/gnome-flashback/libidle-monitor/meta-backend.c
+++ b/gnome-flashback/libidle-monitor/meta-backend.c
@@ -24,8 +24,6 @@
 #include "meta-backend.h"
 #include "meta-idle-monitor-xsync.h"
 
-static MetaBackend *backend = NULL;
-
 G_DEFINE_TYPE (MetaBackend, meta_backend, G_TYPE_OBJECT);
 
 static void
@@ -143,6 +141,8 @@ meta_backend_init (MetaBackend *backend)
 MetaBackend *
 meta_get_backend (void)
 {
+  static MetaBackend *backend = NULL;
+
   if (!backend)
        backend = g_object_new (META_TYPE_BACKEND, NULL);
 
diff --git a/gnome-flashback/libidle-monitor/meta-idle-monitor.c 
b/gnome-flashback/libidle-monitor/meta-idle-monitor.c
index 78704b8..203940f 100644
--- a/gnome-flashback/libidle-monitor/meta-idle-monitor.c
+++ b/gnome-flashback/libidle-monitor/meta-idle-monitor.c
@@ -148,8 +148,6 @@ meta_idle_monitor_init (MetaIdleMonitor *monitor)
 {
 }
 
-static MetaIdleMonitor *device_monitors[256];
-
 /**
  * meta_idle_monitor_get_core:
  *