[master] also link with libutil_io

This fixes problem noticed with
g++ (Debian 4.6.3-2) 4.6.3
GNU ld (GNU Binutils for Debian) 2.22

The linker no longer indirectly links. The linker no loner
searches for dependencies.

This one line addition patch shared on jabber yesterday; builder had problem
again today.

src/bin/auth/Makefile.am

@@ -62,6 +62,7 @@ EXTRA_DIST += auth_messages.mes
 b10_auth_LDADD =  $(top_builddir)/src/lib/datasrc/libdatasrc.la
 b10_auth_LDADD += $(top_builddir)/src/lib/dns/libdns++.la
 b10_auth_LDADD += $(top_builddir)/src/lib/util/libutil.la
+b10_auth_LDADD += $(top_builddir)/src/lib/util/io/libutil_io.la
 b10_auth_LDADD += $(top_builddir)/src/lib/config/libcfgclient.la
 b10_auth_LDADD += $(top_builddir)/src/lib/cc/libcc.la
 b10_auth_LDADD += $(top_builddir)/src/lib/exceptions/libexceptions.la