Fix Makefile.am

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/vorner-sockcreator@3185 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/util/unittests/Makefile.am

@@ -3,5 +3,7 @@ AM_CXXFLAGS = $(B10_CXXFLAGS)
 
 lib_LTLIBRARIES = libutil_unittests.la
 libutil_unittests_la_SOURCES = fork.h fork.cc
+libutil_unittests_la_LIBADD = \
+	$(top_builddir)/src/lib/util/io/libutil_io.la
 
 CLEANFILES = *.gcno *.gcda