test: fix linking for instant messaging

Change-Id: Idb1a328544ebc065a2389fdbd64682648964393c

daemon/test/Makefile.am

@@ -8,6 +8,10 @@ TESTS = run_tests.sh
 test_CXXFLAGS = -DWORKSPACE="$(top_srcdir)/test/" @PTHREAD_CFLAGS@
 test_LDADD = $(top_builddir)/src/libsflphone.la $(top_builddir)/src/libsflphone_la-logger.lo @CPPUNIT_LIBS@ @YAMLCPP_LIBS@
 
+if BUILD_INSTANT_MESSAGING
+test_LDADD += @EXPAT_LIBS@
+endif
+
 EXTRA_DIST = sflphoned-sample.yml history-sample.tpl run_tests.sh
 test_SOURCES = constants.h \
 			   test_utils.h \