nat: Fix make distcheck for the nat

The jenkins runs make distcheck in the default configuration and
not with the nat enabled.

DISTCHECK_CONFIGURE_FLAGS="--enable-nat" make distcheck
diff --git a/openbsc/tests/bsc-nat-trie/Makefile.am b/openbsc/tests/bsc-nat-trie/Makefile.am
index 355ed64..ba40f18 100644
--- a/openbsc/tests/bsc-nat-trie/Makefile.am
+++ b/openbsc/tests/bsc-nat-trie/Makefile.am
@@ -9,10 +9,10 @@
 bsc_nat_trie_test_SOURCES = bsc_nat_trie_test.c \
 			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_rewrite_trie.c
 bsc_nat_trie_test_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
-			$(top_srcdir)/src/libctrl/libctrl.a \
-			$(top_srcdir)/src/libmgcp/libmgcp.a \
-			$(top_srcdir)/src/libtrau/libtrau.a \
-			$(top_srcdir)/src/libcommon/libcommon.a \
+			$(top_builddir)/src/libctrl/libctrl.a \
+			$(top_builddir)/src/libmgcp/libmgcp.a \
+			$(top_builddir)/src/libtrau/libtrau.a \
+			$(top_builddir)/src/libcommon/libcommon.a \
 			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) -lrt \
 			$(LIBOSMOSCCP_LIBS) $(LIBOSMOVTY_LIBS) \
 			$(LIBOSMOABIS_LIBS)