Use dh_shlibdeps to calculate depends

This may impact builds on Debian 8, but that version has been out of
support for over three years.  I didnt test it, but since using this
helper is the preferred method it may actually help builds on older
versions.

packages/debian/configure.in

@@ -5,13 +5,6 @@ AC_ARG_WITH(edgex,    [  --with-edgex            Build for Ubiquity-X])
 # NOTE: this file is not actually used. You need to edit configure as well!
 N2N_VERSION=$(../../scripts/version.sh)
 
-DEBIAN_VERSION=`cat /etc/debian_version | grep "^8" | wc -l`
-
-EXTRA_DEP=""
-if test $DEBIAN_VERSION = "0"; then
-EXTRA_DEP=", libzstd1"
-fi
-
 if test "${EXTN+set}" != set; then
     MACHINE=`uname -m`
     SHORT_MACHINE=`echo $MACHINE | cut -b1-3`
@@ -44,7 +37,6 @@ DATE=`date -R`
 AC_SUBST(N2N_VERSION)
 AC_SUBST(EXTN)
 AC_SUBST(DATE)
-AC_SUBST(EXTRA_DEP)
 
 AC_CONFIG_FILES(debian/changelog)
 AC_CONFIG_FILES(debian/files)

packages/debian/debian/control.in

@@ -8,7 +8,7 @@ Build-Depends:
 Package: n2n
 Architecture: @EXTN@
 Suggests: uml-utilities
-Depends: ${shlibs:Depends}, ${misc:Depends} @EXTRA_DEP@
+Depends: ${shlibs:Depends}, ${misc:Depends}
 Conflicts: n2n (<< 2.1.0-1)
 Replaces: n2n (<< 2.1.0-1)
 Description: a layer-two peer-to-peer virtual private network (VPN)

packages/debian/debian/rules.in

@@ -50,6 +50,7 @@ binary-arch: build install
 	cp -r ../etc debian/n2n
 	find debian/n2n -name "*.in" -exec /bin/rm {} ';'
 	find debian/n2n -name "*~" -exec /bin/rm {} ';'
+	dh_shlibdeps
 	dh_link
 	dh_gencontrol
 	dh_md5sums