misc: Linker fix for Ubuntu 11.10

--as-needed was default in Natty and somehow got more strict in
this version of Ubuntu. Link to osmo vty.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 26500a1..19db4f8 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -26,4 +26,5 @@
 
 ipa_proxy_test_SOURCES = ipa_proxy_test.c
 ipa_proxy_test_LDADD = $(top_builddir)/src/libosmoabis.la \
-			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS)
+			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) \
+			$(LIBOSMOVTY_LIBS)