[master] avoided linking libutil_io from lib/util/unittests. it was

simply unnecessary and caused a build failure.

src/lib/util/unittests/Makefile.am

@@ -3,7 +3,5 @@ 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