Linked nsupdate against zscanner.

src/Makefile.am

@@ -314,7 +314,7 @@ libzscanner_la_LIBADD = libknots.la
 knotd_LDADD = libknotd.la libknot.la libknots.la @LIBOBJS@
 knotc_LDADD = libknotd.la libknot.la libknots.la @LIBOBJS@
 khost_LDADD = libknotd.la libknot.la libknots.la @LIBOBJS@
-knsupdate_LDADD = libknotd.la libknot.la libknots.la @LIBOBJS@
+knsupdate_LDADD = libknotd.la libknot.la libknots.la libzscanner.la @LIBOBJS@
 knot_zcompile_LDADD = libknots.la libknot.la libknotd.la @LIBOBJS@
 unittests_LDADD = libknotd.la libknots.la @LIBOBJS@
 unittests_zcompile_LDADD = libknot.la libknots.la libknotd.la @LIBOBJS@