fix debug after clode cleanup

During code restructuring earlier in
77e9559d I overlooked that VTIM_real()
may not be declared where debug output is used

src/debug.h

 #ifdef DEBUG
 #include <stdio.h>
+#include "vtim.h"
 #define Debug(fmt, ...) printf(fmt, __VA_ARGS__)
 #define VSLdbgv(req, fmt, ...)						\
 	do {								\