nat: Move the IMSI/TMSI filtering to a new and dedicated file
Move all routines related to filtering to a separate file.
diff --git a/openbsc/tests/bsc-nat/Makefile.am b/openbsc/tests/bsc-nat/Makefile.am
index e9fcb41..bd3d33f 100644
--- a/openbsc/tests/bsc-nat/Makefile.am
+++ b/openbsc/tests/bsc-nat/Makefile.am
@@ -10,6 +10,7 @@
$(top_srcdir)/src/osmo-bsc_nat/bsc_filter.c \
$(top_srcdir)/src/osmo-bsc_nat/bsc_sccp.c \
$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_utils.c \
+ $(top_srcdir)/src/osmo-bsc_nat/bsc_nat_filter.c \
$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_rewrite.c \
$(top_srcdir)/src/osmo-bsc_nat/bsc_mgcp_utils.c
bsc_nat_test_LDADD = $(top_builddir)/src/libbsc/libbsc.a \