Debian change: write pid-file even using systemd.
diff --git a/debian/init b/debian/init
index 3db7dca..0a6b176 100644
--- a/debian/init
+++ b/debian/init
@@ -277,9 +277,8 @@
stop_resolvconf
;;
systemd-exec)
-# --pid-file without argument disables writing a PIDfile, we don't need one with sytemd.
# Enable DBus by default because we use DBus activation with systemd.
- exec $DAEMON --keep-in-foreground --pid-file --enable-dbus \
+ exec $DAEMON --keep-in-foreground --enable-dbus \
${MAILHOSTNAME:+ -m $MAILHOSTNAME} \
${MAILTARGET:+ -t $MAILTARGET} \
${DNSMASQ_USER:+ -u $DNSMASQ_USER} \