[gnome-session] build: don't forget to link gnome-session-is-accelerated to Xlib

[Cosimo Cecchi <cosimoc src gnome org>]

commit 402afb93ca0ddeff6ae857f728678316ccfac8c8
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Tue Nov 30 17:04:48 2010 +0100

    build: don't forget to link gnome-session-is-accelerated to Xlib

 tools/Makefile.am |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/tools/Makefile.am b/tools/Makefile.am
index 7808cc8..fbc41b5 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -30,6 +30,7 @@ gnome_session_is_accelerated_CPPFLAGS =		\
 	$(GL_TEST_CFLAGS)
 
 gnome_session_is_accelerated_LDADD = 		\
-	$(GL_TEST_LIBS)
+	$(GL_TEST_LIBS)				\
+	$(X_LIBS)
 
 -include $(top_srcdir)/git.mk