[tests] Change the db_test to link to the libopenbsc.a

This should keep the test compiling in the future. It will
link to the libopenbsc.a to get all symbols. We do this in
the other tests too.

tests/db/Makefile.am

@@ -3,6 +3,6 @@ AM_CFLAGS=-Wall -ggdb3
 
 noinst_PROGRAMS = db_test
 
-db_test_SOURCES = db_test.c $(top_srcdir)/src/db.c $(top_srcdir)/src/gsm_subscriber.c
-db_test_LDADD = -ldl -ldbi
+db_test_SOURCES = db_test.c
+db_test_LDADD = $(top_builddir)/src/libbsc.a -ldl -ldbi
 

tests/db/db_test.c

@@ -100,3 +100,7 @@ int main() {
 
 	return 0;
 }
+
+/* stubs */
+void input_event(void) {}
+void nm_state_event(void) {}