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/include/openbsc/Makefile.am b/openbsc/include/openbsc/Makefile.am
index 6ba6d1b..8f7c1c4 100644
--- a/openbsc/include/openbsc/Makefile.am
+++ b/openbsc/include/openbsc/Makefile.am
@@ -13,7 +13,7 @@
 		osmo_bsc_rf.h osmo_bsc.h network_listen.h bsc_nat_sccp.h \
 		osmo_msc_data.h osmo_bsc_grace.h sms_queue.h abis_om2000.h \
 		bss.h gsm_data_shared.h control_cmd.h ipaccess.h mncc_int.h \
-		arfcn_range_encode.h nat_rewrite_trie.h
+		arfcn_range_encode.h nat_rewrite_trie.h bsc_nat_callstats.h
 
 openbsc_HEADERS = gsm_04_08.h meas_rep.h bsc_api.h
 openbscdir = $(includedir)/openbsc
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)
diff --git a/openbsc/tests/bsc-nat/Makefile.am b/openbsc/tests/bsc-nat/Makefile.am
index 1078d9b..d773f26 100644
--- a/openbsc/tests/bsc-nat/Makefile.am
+++ b/openbsc/tests/bsc-nat/Makefile.am
@@ -15,10 +15,10 @@
 			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_rewrite_trie.c \
 			$(top_srcdir)/src/osmo-bsc_nat/bsc_mgcp_utils.c
 bsc_nat_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)