nfd: Update to 0.6.3

Change-Id: Ie3890f6d66995b0394d5cd73c4efe477db657b9d
diff --git a/nfd/debian/rules b/nfd/debian/rules
index 50495b4..66595bb 100755
--- a/nfd/debian/rules
+++ b/nfd/debian/rules
@@ -11,7 +11,7 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++11
+CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
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