Do not override the -std= flag in CXXFLAGS

Let the package's build system choose what language standard it wants.
This is not something that downstream distributions should modify.

Change-Id: I4ceb8e6298e783e0381d7520fca3d7b07c5d4072
diff --git a/libchronosync/debian/rules b/libchronosync/debian/rules
index 762e694..fef68d0 100755
--- a/libchronosync/debian/rules
+++ b/libchronosync/debian/rules
@@ -11,7 +11,6 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
diff --git a/libpsync/debian/rules b/libpsync/debian/rules
index 9d9a9e4..082f9e1 100755
--- a/libpsync/debian/rules
+++ b/libpsync/debian/rules
@@ -3,10 +3,8 @@
 # output every command that modifies files on the build system.
 #export DH_VERBOSE = 1
 
-
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
@@ -38,4 +36,3 @@
 .PHONY: override_dh_strip
 override_dh_strip:
 	dh_strip --dbg-package=libpsync-dbg
-
diff --git a/name-based-access-control/debian/rules b/name-based-access-control/debian/rules
index 2123dde..6d7eee7 100755
--- a/name-based-access-control/debian/rules
+++ b/name-based-access-control/debian/rules
@@ -3,10 +3,8 @@
 # output every command that modifies files on the build system.
 #export DH_VERBOSE = 1
 
-
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
@@ -38,4 +36,3 @@
 .PHONY: override_dh_strip
 override_dh_strip:
 	dh_strip --dbg-package=libndn-nac-dbg
-
diff --git a/ndn-cxx/debian/rules b/ndn-cxx/debian/rules
index ee35589..2df4a7a 100755
--- a/ndn-cxx/debian/rules
+++ b/ndn-cxx/debian/rules
@@ -11,7 +11,6 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
diff --git a/ndn-traffic-generator/debian/rules b/ndn-traffic-generator/debian/rules
index d0f2c57..1f86a80 100755
--- a/ndn-traffic-generator/debian/rules
+++ b/ndn-traffic-generator/debian/rules
@@ -11,7 +11,6 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
diff --git a/ndncert/debian/rules b/ndncert/debian/rules
index 983e7d5..2e22fa8 100755
--- a/ndncert/debian/rules
+++ b/ndncert/debian/rules
@@ -11,7 +11,6 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
diff --git a/ndnmap-data-collector/debian/rules b/ndnmap-data-collector/debian/rules
index e97dfa1..f0fb8ef 100755
--- a/ndnmap-data-collector/debian/rules
+++ b/ndnmap-data-collector/debian/rules
@@ -11,7 +11,6 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
diff --git a/ndns/debian/rules b/ndns/debian/rules
index 208f7be..f702921 100755
--- a/ndns/debian/rules
+++ b/ndns/debian/rules
@@ -11,7 +11,6 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
diff --git a/nfd/debian/rules b/nfd/debian/rules
index 5c8b367..48aa900 100755
--- a/nfd/debian/rules
+++ b/nfd/debian/rules
@@ -11,7 +11,6 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
diff --git a/nlsr/debian/rules b/nlsr/debian/rules
index 149a19c..162b6a6 100755
--- a/nlsr/debian/rules
+++ b/nlsr/debian/rules
@@ -11,7 +11,6 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %:
diff --git a/repo-ng/debian/rules b/repo-ng/debian/rules
index e97dfa1..f0fb8ef 100755
--- a/repo-ng/debian/rules
+++ b/repo-ng/debian/rules
@@ -11,7 +11,6 @@
 
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 CXXFLAGS := $(shell dpkg-buildflags --get CXXFLAGS)
-CXXFLAGS += -std=c++14
 LIBDIR := /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 
 %: