ndnmap-data-collector: Update

Change-Id: Ibdede19a63c561ac978004e61d4be83213cd0c6f
diff --git a/ndnmap-data-collector/debian/rules b/ndnmap-data-collector/debian/rules
index 97288fa..2c7b2bf 100755
--- a/ndnmap-data-collector/debian/rules
+++ b/ndnmap-data-collector/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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