Link libosmo-ranap against libosmovty

This fixes the following dh-shlibdeps warnings:

Change-Id: I08be684c45c7e95315dba6ccf9892fe6fc7c3f24
dpkg-shlibdeps: warning: symbol install_element used by debian/libosmo-ranap1/usr/lib/x86_64-linux-gnu/libosmo-ranap.so.1.0.0 found in none of the libraries
dpkg-shlibdeps: warning: symbol vty_out used by debian/libosmo-ranap1/usr/lib/x86_64-linux-gnu/libosmo-ranap.so.1.0.0 found in none of the libraries
diff --git a/src/Makefile.am b/src/Makefile.am
index a45b70b..ebed2bf 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -51,7 +51,7 @@
 RANAP_LIBVERSION=1:0:0
 lib_LTLIBRARIES = libosmo-ranap.la
 libosmo_ranap_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(RANAP_LIBVERSION)
-libosmo_ranap_la_LIBADD = $(OSMOCORE_LIBS) $(OSMOGSM_LIBS) $(OSMOSIGTRAN_LIBS) \
+libosmo_ranap_la_LIBADD = $(OSMOCORE_LIBS) $(OSMOGSM_LIBS) $(OSMOVTY_LIBS) $(OSMOSIGTRAN_LIBS) \
 			  $(ASN1C_LIBS) $(COMMON_LDADD) ranap/libosmo-asn1-ranap.la
 libosmo_ranap_la_SOURCES = ranap_common.c ranap_encoder.c ranap_decoder.c ranap_msg_factory.c iu_helpers.c \
 			   ranap_common_cn.c iu_client.c iu_client_vty.c