ndn-traffic-generator: Update package to build against latest ndn-cxx

Change-Id: Iac93273263fd86c5a55b86c64791b47a1c38c17a
diff --git a/ndn-traffic-generator/Makefile b/ndn-traffic-generator/Makefile
index 8f7ece9..c2b2db1 100644
--- a/ndn-traffic-generator/Makefile
+++ b/ndn-traffic-generator/Makefile
@@ -11,6 +11,6 @@
 VERSION=0.0.5-gef561
 
 # PPA version
-PPA_VERSION=2
+PPA_VERSION=3
 
 include ../packaging.mk