Allow builds with glibc 2.20.
Based on a patch by Peter Hutterer <peter.hutterer@who-t.net>.
See <https://raw.githubusercontent.com/openembedded/oe-core/master/meta/recipes-graphics/xorg-driver/xf86-input-synaptics/always_include_xorg_server.h.patch>.

--- xf86-video-openchrome-0.3.3/src/via_3d.h.~1~	2013-05-23 11:11:28.000000000 -0400
+++ xf86-video-openchrome-0.3.3/src/via_3d.h	2014-12-19 01:17:04.000953259 -0500
@@ -24,6 +24,8 @@
 #ifndef VIA_3D_H
 #define VIA_3D_H
 
+#include <xorg-server.h>
+
 #include "xf86.h"
 #include "via_dmabuffer.h"