parallel builds (make -jX) failed sporadically for the first compilation
(before dependency tracking information was available) due to the race
with python building vcc_if.h

From 8e2751a28b7cb6331b386fbf6e1a7b1bdeafb4b7 Mon Sep 17 00:00:00 2001
From: Nils Goroll <nils.goroll@uplex.de>
Date: Wed, 9 Jan 2013 20:46:13 +0100
Subject: [PATCH] proper dependencies for vmod automake

parallel builds (make -jX) failed sporadically for the first compilation
(before dependency tracking information was available) due to the race
with python building vcc_if.h