filter: Move the method definition to the filter module
Move the filter methods to the filter module. This is
still only usable for the NAT and the _dt/_cr filter
routines need to move back to the bsc_nat in the long
run.
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_ctrl.c b/openbsc/src/osmo-bsc_nat/bsc_nat_ctrl.c
index 4b59b40..439bf33 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_ctrl.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_ctrl.c
@@ -29,6 +29,7 @@
#include <openbsc/ctrl.h>
#include <openbsc/bsc_nat.h>
+#include <openbsc/bsc_msg_filter.h>
#include <openbsc/vty.h>
#include <openbsc/gsm_data.h>