start thinking about vac -- doesn't build yet

src/cmd/vac/stdinc.h

@@ -0,0 +1,8 @@
+#include <u.h>
+#include <libc.h>
+
+#include "venti.h"
+
+typedef uvlong	u64int;
+typedef	uchar	u8int;
+typedef ushort	u16int;