gallium: Add SCons build support for the DRI state tracker.
diff --git a/src/gallium/SConscript b/src/gallium/SConscript
index 0c632ac..b6ceaf3 100644
--- a/src/gallium/SConscript
+++ b/src/gallium/SConscript
@@ -29,6 +29,7 @@
 
 SConscript('state_trackers/python/SConscript')
 SConscript('state_trackers/glx/xlib/SConscript')
+SConscript('state_trackers/dri/SConscript')
 
 if platform == 'windows':
 	SConscript('state_trackers/wgl/SConscript')