buildsys: remove outdated preinst helper

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

debian/preinst

@@ -1,32 +0,0 @@
-#!/bin/sh
-
-set -e
-
-DAEMONS="pveproxy spiceproxy pvestatd pvedaemon"
-
-case "$1" in
-    install|upgrade)
-	old_version=$2
-	if [ ! -e /proxmox_install_mode ]; then  
-	    if dpkg --compare-versions "$old_version" lt '3.3-9' ; then
-		echo "Detected old pve-manager version - using stop/start to restart daemons"
-		for i in ${DAEMONS}; do
-		    if [ -e "/usr/bin/$i" ]; then
-			service $i stop
-		    fi
-		done
-		sleep 2
-	    fi
-	fi
-    ;;
-
-    abort-upgrade)
-    ;;
-
-    *)
-        echo "preinst called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-exit 0