nfd: Update to 0.5.1-72-gf4056d02

Change-Id: I085270f43c34991101bca8ecac9ba319c644bf6d
diff --git a/nfd/Makefile b/nfd/Makefile
index 35ed35f..abd0bdf 100644
--- a/nfd/Makefile
+++ b/nfd/Makefile
@@ -2,13 +2,13 @@
 GIT_URL=https://github.com/named-data/NFD.git
 
 # Tag name or commit hash for checkout
-GIT_VERSION=NFD-0.5.1
+GIT_VERSION=f4056d0242536f85b7d7b4de1b5ac50dad65c233
 
 # Package name
 NAME=nfd
 
 # Package version
-VERSION=0.5.1
+VERSION=0.5.1-72-gf4056d02
 
 # PPA version
 PPA_VERSION=2