[2940] Explicitly link with the DDNS module with libdhcp++.

Observed compilation issues on Debian 7 when libdhcp++ was not explicitly
linked to the DDNS module.

src/bin/d2/Makefile.am

@@ -76,6 +76,7 @@ b10_dhcp_ddns_LDADD += $(top_builddir)/src/lib/asiodns/libb10-asiodns.la
 b10_dhcp_ddns_LDADD += $(top_builddir)/src/lib/asiolink/libb10-asiolink.la
 b10_dhcp_ddns_LDADD += $(top_builddir)/src/lib/config/libb10-cfgclient.la
 b10_dhcp_ddns_LDADD += $(top_builddir)/src/lib/dhcp_ddns/libb10-dhcp_ddns.la
+b10_dhcp_ddns_LDADD += $(top_builddir)/src/lib/dhcp/libb10-dhcp++.la
 b10_dhcp_ddns_LDADD += $(top_builddir)/src/lib/dhcpsrv/libb10-dhcpsrv.la
 b10_dhcp_ddns_LDADD += $(top_builddir)/src/lib/dns/libb10-dns++.la
 b10_dhcp_ddns_LDADD += $(top_builddir)/src/lib/util/libb10-util.la

src/bin/d2/tests/Makefile.am

@@ -94,6 +94,7 @@ d2_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libb10-asiolink.la
 d2_unittests_LDADD += $(top_builddir)/src/lib/cc/libb10-cc.la
 d2_unittests_LDADD += $(top_builddir)/src/lib/config/libb10-cfgclient.la
 d2_unittests_LDADD += $(top_builddir)/src/lib/dhcp_ddns/libb10-dhcp_ddns.la
+d2_unittests_LDADD += $(top_builddir)/src/lib/dhcp/libb10-dhcp++.la
 d2_unittests_LDADD += $(top_builddir)/src/lib/dhcpsrv/libb10-dhcpsrv.la
 d2_unittests_LDADD += $(top_builddir)/src/lib/dns/libb10-dns++.la
 d2_unittests_LDADD += $(top_builddir)/src/lib/util/libb10-util.la