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/libfilter/bsc_msg_filter.c b/openbsc/src/libfilter/bsc_msg_filter.c
index 64f6d73..8f2e1ca 100644
--- a/openbsc/src/libfilter/bsc_msg_filter.c
+++ b/openbsc/src/libfilter/bsc_msg_filter.c
@@ -2,7 +2,7 @@
  * Access filtering
  */
 /*
- * (C) 2010-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2010-2015 by Holger Hans Peter Freyther <zecke@selfish.org>
  * (C) 2010-2012 by On-Waves
  * All Rights Reserved
  *
@@ -21,6 +21,8 @@
  *
  */
 
+#include <openbsc/bsc_msg_filter.h>
+
 #include <openbsc/bsc_nat.h>
 #include <openbsc/bsc_nat_sccp.h>
 #include <openbsc/bsc_msc.h>
@@ -28,7 +30,6 @@
 #include <openbsc/debug.h>
 #include <openbsc/ipaccess.h>
 
-#include <osmocom/core/linuxlist.h>
 #include <osmocom/core/talloc.h>
 #include <osmocom/gsm/gsm0808.h>
 
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat.c b/openbsc/src/osmo-bsc_nat/bsc_nat.c
index 5c3b696..ebd291b 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat.c
@@ -39,6 +39,7 @@
 #include <openbsc/bsc_msc.h>
 #include <openbsc/bsc_nat.h>
 #include <openbsc/bsc_nat_sccp.h>
+#include <openbsc/bsc_msg_filter.h>
 #include <openbsc/ipaccess.h>
 #include <openbsc/abis_nm.h>
 #include <openbsc/socket.h>
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>
 
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c b/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c
index 70ad577..e658569 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c
@@ -23,6 +23,7 @@
 
 #include <openbsc/bsc_nat.h>
 #include <openbsc/bsc_nat_sccp.h>
+#include <openbsc/bsc_msg_filter.h>
 #include <openbsc/bsc_msc.h>
 #include <openbsc/gsm_data.h>
 #include <openbsc/debug.h>
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c b/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c
index 9e66cdc..bf8ba5c 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c
@@ -22,6 +22,7 @@
 #include <openbsc/gsm_data.h>
 #include <openbsc/bsc_nat.h>
 #include <openbsc/bsc_nat_sccp.h>
+#include <openbsc/bsc_msg_filter.h>
 #include <openbsc/bsc_msc.h>
 #include <openbsc/gsm_04_08.h>
 #include <openbsc/mgcp.h>