vacfs: remove 9P2000.u relic

R=rsc
http://codereview.appspot.com/5970072
diff --git a/src/cmd/vac/vacfs.c b/src/cmd/vac/vacfs.c
index 3fbcd57..c660939 100644
--- a/src/cmd/vac/vacfs.c
+++ b/src/cmd/vac/vacfs.c
@@ -701,11 +701,6 @@
 	dir.uid = vd->uid;
 	dir.gid = vd->gid;
 	dir.muid = vd->mid;
-#ifdef PLAN9PORT
-	dir.ext = ext;
-	dir.uidnum = atoi(vd->uid);
-	dir.gidnum = atoi(vd->gid);
-#endif
 
 	ret = convD2M(&dir, p, np);
 #ifdef PLAN9PORT