[mutter/gnome-3-30] window-x11: Add lost definition for TAKE_FOCUS_FALLBACK_DELAY_MS

[Marco Trevisan <marcotrevi src gnome org>]

commit a51188f8d79e018425f2469b47c01f1ddde9227d
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Fri Jun 28 20:14:27 2019 +0200

    window-x11: Add lost definition for TAKE_FOCUS_FALLBACK_DELAY_MS
    
    In commit 8abd1b009 (cherry-pick to gnome-3-30 of commit f71151a5d) the
    definition of TAKE_FOCUS_FALLBACK_DELAY_MS was not properly merged.
    
    Include this back to fix the build failure.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/307

 src/x11/window-x11.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/x11/window-x11.c b/src/x11/window-x11.c
index d86d35f61..360299c35 100644
--- a/src/x11/window-x11.c
+++ b/src/x11/window-x11.c
@@ -55,6 +55,8 @@
 #include "backends/meta-logical-monitor.h"
 #include "backends/x11/meta-backend-x11.h"
 
+#define TAKE_FOCUS_FALLBACK_DELAY_MS 250
+
 G_DEFINE_TYPE_WITH_PRIVATE (MetaWindowX11, meta_window_x11, META_TYPE_WINDOW)
 
 static void