Fix compilation with latest ndn-cxx

Change-Id: Iaf468a75466134d18ecbb1fef66e4cb401d781a4
diff --git a/tests/wscript b/tests/wscript
index bacd16b..3e98b34 100644
--- a/tests/wscript
+++ b/tests/wscript
@@ -15,7 +15,7 @@
 
     unit_test = bld.program(
         target="../unit-tests",
-        source=bld.path.ant_glob(['unit-tests/**/*.cpp']),
+        source=bld.path.ant_glob(['unit-tests/**/*.cpp', 'identity-management-fixture.cpp']),
         features=['cxx', 'cxxprogram'],
         use='ChronoSync tests-main',
         includes=['.'],