Update ndn-cxx to 0.5.1-60-gb555b00c

Change-Id: I7b03514e1f0ace8496ff49f04c8b172757ada6f4
diff --git a/ndn-cxx/Makefile b/ndn-cxx/Makefile
index d82a469..4322bfc 100644
--- a/ndn-cxx/Makefile
+++ b/ndn-cxx/Makefile
@@ -2,15 +2,15 @@
 GIT_URL=https://github.com/named-data/ndn-cxx.git
 
 # Tag name or commit hash for checkout
-GIT_VERSION=ndn-cxx-0.5.1
+GIT_VERSION=b555b00c280b9c9ed46f24a1fbebc73b720601af
 
 # Package name
 NAME=ndn-cxx
 
 # Package version
-VERSION=0.5.1
+VERSION=0.5.1-60-gb555b00c
 
 # PPA version
-PPA_VERSION=4
+PPA_VERSION=1
 
 include ../packaging.mk