ndn-cxx: Update to version 0.6.6

Change-Id: Ic1ba8ee1c4d955cbc05dfecde3f6a831e71924fc
diff --git a/ndn-cxx/debian/compat b/ndn-cxx/debian/compat
index 45a4fb7..f599e28 100644
--- a/ndn-cxx/debian/compat
+++ b/ndn-cxx/debian/compat
@@ -1 +1 @@
-8
+10