Do not compile ChronoSync support by default

ChronoSync dependency is now made optional
and is kept for testing purposes only.

Also change sig-type to ecdsa-sha256 in nlsr.conf
as ndn-cxx now has strict checking for it.

refs: #5147

Change-Id: I95c9fb844681ebf2c4e7bbb03cc7796a0795de83
diff --git a/tests/update/test-nfd-rib-command-processor.cpp b/tests/update/test-nfd-rib-command-processor.cpp
index d5fa0c8..ef8c1b6 100644
--- a/tests/update/test-nfd-rib-command-processor.cpp
+++ b/tests/update/test-nfd-rib-command-processor.cpp
@@ -27,6 +27,8 @@
 #include "../test-common.hpp"
 #include "../control-commands.hpp"
 
+#include <boost/lexical_cast.hpp>
+
 namespace nlsr {
 namespace test {