6375 Add native name demangling support

@@ -11,10 +11,12 @@
 
 #
 # Copyright (c) 2012 by Delphix. All rights reserved.
 # Copyright 2014 Garrett D'Amore <garrett@damore.org>
 # Copyright 2014 Nexenta Systems, Inc. All rights reserved.
+# Copyright 2017 Jason King
 #
 
 SUBDIRS = date dis dladm iconv libnvpair_json libsff printf xargs grep_xpg4
+SUBDIRS += demangle
 
 include $(SRC)/test/Makefile.com