Sync build system and CI scripts with ndn-tools

Change-Id: I21dc5349f3f3c819bf8590fe709157ce0bc26b44
diff --git a/wscript b/wscript
index 9dd7fb1..9107c75 100644
--- a/wscript
+++ b/wscript
@@ -22,18 +22,14 @@
 
 def build(bld):
     bld.program(
-        features='cxx',
         target='ndn-traffic',
         source='src/ndn-traffic-client.cpp',
-        use='NDN_CXX',
-        )
+        use='NDN_CXX')
 
     bld.program(
-        features='cxx',
         target='ndn-traffic-server',
         source='src/ndn-traffic-server.cpp',
-        use='NDN_CXX',
-        )
+        use='NDN_CXX')
 
     bld.install_files('${SYSCONFDIR}/ndn', ['ndn-traffic-client.conf.sample',
                                             'ndn-traffic-server.conf.sample'])