ndndump: Update to use the latest ndn-cxx library

Change-Id: I51e1a486b4fa8b186d128da7bc18cd8c7899ddfb
diff --git a/ndndump/Makefile b/ndndump/Makefile
index 86bf867..2eab769 100644
--- a/ndndump/Makefile
+++ b/ndndump/Makefile
@@ -11,6 +11,6 @@
 VERSION=0.5.3
 
 # PPA version
-PPA_VERSION=4
+PPA_VERSION=7
 
 include ../packaging.mk