MT#55283 fix iptables install path for backports

Older debhelpers don't support conditional installation locations.
Restore the previous approach of doing it through the rules file.

Change-Id: I427b44bed24bd9956c33c81cd28a75b262c46b68

pkg/deb/backports/buster

@@ -27,6 +27,17 @@ override_dh_dwz:
 	# Disable, as dwz cannot cope with some of the plugins generated.
 EOF
 
+# Fix module installation location
+rm ${DIST}/rtpengine-iptables.dirs
+rm ${DIST}/rtpengine-iptables.install
+cat >> ${DIST}/rules <<'EOF'
+
+override_dh_install:
+	dh_install
+	dh_installdirs -prtpengine-iptables $(XTABLES_DIR)
+	install -m 0644 iptables-extension/libxt_RTPENGINE.so debian/rtpengine-iptables/$(XTABLES_DIR)
+EOF
+
 if command -v wrap-and-sort &>/dev/null ; then
   wrap-and-sort -sat -d ${DIST}
 else

pkg/deb/backports/focal

@@ -27,6 +27,17 @@ override_dh_dwz:
 	# Disable, as dwz cannot cope with some of the plugins generated.
 EOF
 
+# Fix module installation location
+rm ${DIST}/rtpengine-iptables.dirs
+rm ${DIST}/rtpengine-iptables.install
+cat >> ${DIST}/rules <<'EOF'
+
+override_dh_install:
+	dh_install
+	dh_installdirs -prtpengine-iptables $(XTABLES_DIR)
+	install -m 0644 iptables-extension/libxt_RTPENGINE.so debian/rtpengine-iptables/$(XTABLES_DIR)
+EOF
+
 if command -v wrap-and-sort &>/dev/null ; then
   wrap-and-sort -sat -d ${DIST}
 else

pkg/deb/backports/stretch

@@ -36,6 +36,17 @@ override_dh_systemd_start:
 	dh_systemd_start -prtpengine-recording-daemon --name=rtpengine-recording-nfs-mount
 EOF
 
+# Fix module installation location
+rm ${DIST}/rtpengine-iptables.dirs
+rm ${DIST}/rtpengine-iptables.install
+cat >> ${DIST}/rules <<'EOF'
+
+override_dh_install:
+	dh_install
+	dh_installdirs -prtpengine-iptables $(XTABLES_DIR)
+	install -m 0644 iptables-extension/libxt_RTPENGINE.so debian/rtpengine-iptables/$(XTABLES_DIR)
+EOF
+
 if command -v wrap-and-sort &>/dev/null ; then
   wrap-and-sort -sat -d ${DIST}
 else