prepare for dri3proto

src/etc/mtree/BSD.x11.dist

@@ -1,4 +1,4 @@
-#       $OpenBSD: BSD.x11.dist,v 1.45 2017/08/05 14:13:39 jsg Exp $
+#       $OpenBSD: BSD.x11.dist,v 1.46 2018/06/07 21:23:44 matthieu Exp $
 
 /set type=dir uname=root gname=wheel mode=0755
 .
@@ -358,6 +358,8 @@
                     ..
                     dri2proto
                     ..
+                    dri3proto
+                    ..
                     fixesproto
                     ..
                     fontconfig