libosmo-rspro: Avoid useless dependency to libosmo-abis

Change-Id: I124003dafb7b90664e6614965990243771be62a9
dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libosmo-rspro1/usr/lib/x86_64-linux-gnu/libosmo-rspro.so.1.0.0 was not linked against libosmoabis.so.6 (it uses none of the library's symbols)
diff --git a/src/Makefile.am b/src/Makefile.am
index 81fe4ca..5f71df5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -16,8 +16,8 @@
 RSPRO_LIBVERSION=1:0:0
 lib_LTLIBRARIES = libosmo-rspro.la
 libosmo_rspro_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(RSPRO_LIBVERSION)
-# OSMOGSM_LIBS not needed, we don't use any of its symbols, only the header above
-libosmo_rspro_la_LIBADD = $(OSMOCORE_LIBS) $(OSMOABIS_LIBS) \
+# OSMOGSM_LIBS, OSMOABIS_LIBS not needed, we don't use any of its symbols, only the header above
+libosmo_rspro_la_LIBADD = $(OSMOCORE_LIBS) \
 			  rspro/libosmo-asn1-rspro.la
 libosmo_rspro_la_SOURCES = rspro_util.c asn1c_helpers.c