[gnome-session] [build] Add missing includes

[Vincent Untz <vuntz src gnome org>]

commit 52c9e79663be6a99e75a4ac8bb95c0a4e46aa4ed
Author: Daniel Macks <dmacks netspace org>
Date:   Tue Jun 30 00:05:13 2009 +0200

    [build] Add missing includes
    
    This is needed on some platforms.
    
    http://bugzilla.gnome.org/show_bug.cgi?id=585672

 gnome-session/gs-idle-monitor.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gnome-session/gs-idle-monitor.c b/gnome-session/gs-idle-monitor.c
index edf9815..35f77d2 100644
--- a/gnome-session/gs-idle-monitor.c
+++ b/gnome-session/gs-idle-monitor.c
@@ -29,6 +29,7 @@
 #include <X11/extensions/sync.h>
 
 #ifdef HAVE_XTEST
+#include <X11/keysym.h>
 #include <X11/extensions/XTest.h>
 #endif /* HAVE_XTEST */