ndn-tools: Update to version 0.6.4

Change-Id: Idc9e295a4569e3089b10eff96eef152911d315c0
diff --git a/ndn-tools/debian/control b/ndn-tools/debian/control
index 8a24eae..6c862b9 100644
--- a/ndn-tools/debian/control
+++ b/ndn-tools/debian/control
@@ -7,7 +7,7 @@
  pkg-config (>= 0.26),
  libpcap-dev,
  python-sphinx,
- libndn-cxx-dev (>= 0.6.5),
+ libndn-cxx-dev (>= 0.6.6),
  git
 Standards-Version: 3.9.2
 Section: net