jni: Upgrade NFD/ndn-cxx to version 0.6.6

Change-Id: I27feb9fa93d8c3d0533d04bb3646a9fd80f0289b
diff --git a/app/src/main/jni/Android.mk b/app/src/main/jni/Android.mk
index 6b99cba..248db74 100644
--- a/app/src/main/jni/Android.mk
+++ b/app/src/main/jni/Android.mk
@@ -9,4 +9,4 @@
 LOCAL_CFLAGS := -DBOOST_LOG_DYN_LINK=1
 include $(BUILD_SHARED_LIBRARY)
 
-$(call import-module,../packages/nfd/0.6.5)
+$(call import-module,../packages/nfd/0.6.6)