[metacity] MetaScreen: include _GTK_FRAME_EXTENTS in _NET_SUPPORTED

[Alberts Muktupāvels <muktupavels src gnome org>]

commit e302505ffead091bd321cbccf08ba339a527d84a
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Sun Mar 2 23:16:50 2014 +0100

    MetaScreen: include _GTK_FRAME_EXTENTS in _NET_SUPPORTED
    
    This enables CSD for X11 clients (in XWayland and in X11)

 src/core/screen.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/core/screen.c b/src/core/screen.c
index b371fcf..7c9ca88 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -100,6 +100,8 @@ set_supported_hint (MetaScreen *screen)
 #include "atomnames.h"
 #undef item
 #undef EWMH_ATOMS_ONLY
+
+    screen->display->atom__GTK_FRAME_EXTENTS,
   };
 
   XChangeProperty (screen->display->xdisplay, screen->xroot,