build: Fix build issue with Boost.Asio on Ubuntu+clang

refs #3588

Change-Id: Ica155f22fa615eed8a14b5765cdce0f6e480b1de
diff --git a/wscript b/wscript
index 206bb2d..f7b9cd9 100644
--- a/wscript
+++ b/wscript
@@ -125,6 +125,7 @@
 
     if conf.env['CXX_NAME'] == 'clang' and conf.env.BOOST_VERSION_NUMBER < 105800:
         conf.define('BOOST_ASIO_HAS_STD_ARRAY', 1) # Workaround for http://redmine.named-data.net/issues/3360#note-14
+        conf.define('BOOST_ASIO_HAS_STD_CHRONO', 1) # Solution documented at https://redmine.named-data.net/issues/3588#note-10
 
     conf.load('unix-socket')
     conf.checkWebsocket(mandatory=True)