[gnome-flashback] common: remove GNOME_DESKTOP_USE_UNSTABLE_API from gf-bg files

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 58e98790e704a0771ea9660eea6d8f2dafb97089
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Mar 20 15:27:55 2021 +0200

    common: remove GNOME_DESKTOP_USE_UNSTABLE_API from gf-bg files

 gnome-flashback/libcommon/gf-bg.c | 1 -
 gnome-flashback/libcommon/gf-bg.h | 4 ----
 2 files changed, 5 deletions(-)
---
diff --git a/gnome-flashback/libcommon/gf-bg.c b/gnome-flashback/libcommon/gf-bg.c
index 6ce69ec..bafe74c 100644
--- a/gnome-flashback/libcommon/gf-bg.c
+++ b/gnome-flashback/libcommon/gf-bg.c
@@ -45,7 +45,6 @@ Author: Soren Sandmann <sandmann redhat com>
 #include <cairo.h>
 #include <cairo-xlib.h>
 
-#define GNOME_DESKTOP_USE_UNSTABLE_API
 #include "gnome-bg-slide-show.h"
 #include "gnome-bg-crossfade.h"
 
diff --git a/gnome-flashback/libcommon/gf-bg.h b/gnome-flashback/libcommon/gf-bg.h
index 6ee1eee..129a427 100644
--- a/gnome-flashback/libcommon/gf-bg.h
+++ b/gnome-flashback/libcommon/gf-bg.h
@@ -25,10 +25,6 @@
 #ifndef GF_BG_H
 #define GF_BG_H
 
-#ifndef GNOME_DESKTOP_USE_UNSTABLE_API
-#error    GnomeBG is unstable API. You must define GNOME_DESKTOP_USE_UNSTABLE_API before including gnome-bg.h
-#endif
-
 #include <gdk/gdk.h>
 #include <gio/gio.h>
 #include <gdesktop-enums.h>